Added .NET Standard support

Changes made in this release:
- Updated the projects to support .NET Standard 2.0.  The assemblies now target .NET 4.0 and later and .NET Standard 2.0.  Closes #7.
- Updated the PDIDatesTest, PDIParserTest, and RFC2445RecurTest demo console applications to be .NET Core 2.1 applications.
- Updated all Windows Forms and web applications to use .NET 4.7.2 and enabled high DPI support in the Windows Forms applications.
- Added EWSoftware.PDI.WinForms.Design.csproj to allow updating the Windows Forms controls in the designer.  EWSoftware.PDI.WinForms.csproj is used to build the NuGet package.
- Breaking Change: Removed the VTimeZoneCollection.Lock property.  Use the new AcquireReaderLock, ReleaseReaderLock, AcquireWriterLock, and ReleaseWriterLock methods instead.
- Fixed up some code analysis issues.

Doc/EWSoftwarePDI.shfbproj

@@ -26,24 +26,14 @@
     </HtmlHelp1xCompilerPath>
     <WorkingPath>
     </WorkingPath>
-    <FrameworkVersion>.NET Framework 4.0</FrameworkVersion>
+    <FrameworkVersion>Cross-platform (.NET Core/.NET Standard)</FrameworkVersion>
     <HelpTitle>EWSoftware.PDI Namespace Documentation</HelpTitle>
     <CopyrightHref>https://github.com/EWSoftware/PDI</CopyrightHref>
     <CopyrightText>[v{%40HelpFileVersion}] Copyright \xA9 2003-2018, Eric Woodruff, All Rights Reserved</CopyrightText>
     <FeedbackEMailAddress>Eric%40EWoodruff.us</FeedbackEMailAddress>
     <PresentationStyle>VS2013</PresentationStyle>
     <SyntaxFilters>Standard</SyntaxFilters>
     <ComponentConfigurations>
-      <ComponentConfig id="IntelliSense Component" enabled="True">
-        <component id="IntelliSense Component">
-          <!-- Output options (optional)
-  Attributes:
-    Include namespaces (false by default)
-    Namespaces comments filename ("Namespaces" if not specified or empty)
-    Output folder (current folder if not specified or empty) -->
-          <output includeNamespaces="false" namespacesFile="Namespaces" folder="{@ProjectFolder}..\Deployment" />
-        </component>
-      </ComponentConfig>
     </ComponentConfigurations>
     <DocumentationSources>
       <DocumentationSource sourceFile="..\Source\EWSPDI.sln" />
@@ -59,7 +49,7 @@
       <NamespaceSummaryItem name="EWSoftware.PDI.Web.Design" isDocumented="True">Personal Data Interchange ASP.NET web server control designers developed by Eric Woodruff.</NamespaceSummaryItem>
       <NamespaceSummaryItem name="EWSoftware.PDI.Windows.Forms" isDocumented="True">Personal Data Interchange Windows Forms controls developed by Eric Woodruff.</NamespaceSummaryItem>
     </NamespaceSummaries>
-    <HelpFileVersion>2015.1.19.0</HelpFileVersion>
+    <HelpFileVersion>2018.11.17.0</HelpFileVersion>
     <ApiFilter />
     <PlugInConfigurations>
       <PlugInConfig id="Output Deployment" enabled="True">
@@ -160,6 +150,7 @@
     <AppendMarkdownFileExtensionsToUrls>False</AppendMarkdownFileExtensionsToUrls>
     <SourceCodeBasePath>..\Source\</SourceCodeBasePath>
     <WarnOnMissingSourceContext>True</WarnOnMissingSourceContext>
+    <SaveComponentCacheCapacity>100</SaveComponentCacheCapacity>
   </PropertyGroup>
   <!-- There are no properties for these groups.  AnyCPU needs to appear in
        order for Visual Studio to perform the build.  The others are optional

MasterBuild.bat

@@ -1,30 +1,17 @@
 @ECHO OFF
 CLS
 
-REM Use the earliest version of MSBuild available
 IF EXIST "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\MSBuild\15.0" SET "MSBUILD=%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Community\MSBuild\15.0\bin\MSBuild.exe"
 IF EXIST "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Professional\MSBuild\15.0" SET "MSBUILD=%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\bin\MSBuild.exe"
 IF EXIST "%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0" SET "MSBUILD=%ProgramFiles(x86)%\Microsoft Visual Studio\2017\Enterprise\MSBuild\15.0\bin\MSBuild.exe"
-IF EXIST "%ProgramFiles(x86)%\MSBuild\14.0" SET "MSBUILD=%ProgramFiles(x86)%\MSBuild\14.0\bin\MSBuild.exe"
-IF EXIST "%ProgramFiles(x86)%\MSBuild\12.0" SET "MSBUILD=%ProgramFiles(x86)%\MSBuild\12.0\bin\MSBuild.exe"
 
 "%MSBUILD%" /nologo /v:m /m Source\EWSPDI.sln /t:Clean;Build "/p:Configuration=Release;Platform=Any CPU"
 
-"%MSBUILD%" /nologo /v:m /m Source\CSharpDemos.sln /t:Clean;Build "/p:Configuration=Release;Platform=Any CPU"
-
-"%MSBUILD%" /nologo /v:m /m Source\VBNetDemos.sln /t:Clean;Build "/p:Configuration=Release;Platform=Any CPU"
-
-"%MSBUILD%" /nologo /v:m /m Source\PDIWebDemo.sln /t:Clean;Build
+COPY Source\EWSPDI\bin\Release\*.nupkg .\Deployment
+COPY Source\EWSPDIData\bin\Release\*.nupkg .\Deployment
+COPY Source\EWSPDIWeb\bin\Release\*.nupkg .\Deployment
+COPY Source\EWSPDIWinForms\bin\Release\*.nupkg .\Deployment
 
 IF NOT "%SHFBROOT%"=="" "%MSBUILD%" /nologo /v:m Doc\EWSoftwarePDI.sln /t:Clean;Build "/p:Configuration=Release;Platform=Any CPU"
 
 IF "%SHFBROOT%"=="" ECHO **** Sandcastle help file builder not installed.  Skipping help build. ****
-
-CD .\NuGet
-
-..\Source\packages\NuGet.CommandLine.4.7.1\tools\NuGet.exe Pack EWSoftware.PDI.nuspec -NoPackageAnalysis -OutputDirectory ..\Deployment
-..\Source\packages\NuGet.CommandLine.4.7.1\tools\NuGet.exe Pack EWSoftware.PDI.Data.nuspec -NoPackageAnalysis -OutputDirectory ..\Deployment
-..\Source\packages\NuGet.CommandLine.4.7.1\tools\NuGet.exe Pack EWSoftware.PDI.Web.Controls.nuspec -NoPackageAnalysis -OutputDirectory ..\Deployment
-..\Source\packages\NuGet.CommandLine.4.7.1\tools\NuGet.exe Pack EWSoftware.PDI.Windows.Forms.nuspec -NoPackageAnalysis -OutputDirectory ..\Deployment
-
-CD ..

README.md

@@ -1,4 +1,7 @@
 # EWSoftware.PDI Library
+_**NOTE: The master branch is for Visual Studio 2017 15.5 and later.  For Visual Studio 2017 15.4 and earlier,
+use the Legacy branch.**_
+
 The EWSoftware Personal Data Interchange (PDI) Library presents you with a complete set of classes that let you
 have access to all objects, properties, parameter types, and data types as defined by the vCard (RFC 2426),
 vCalendar, and iCalendar (RFC 2445) specifications.  Using these classes, you can read and write data files in a

Source/.editorconfig

@@ -8,7 +8,7 @@ end_of_line = crlf
 # (Please don't specify an indent_size here; that has too many unintended consequences.)
 
 # XML files of various types
-[*.{xml,aml,csproj,.shfbproj,vbproj,vcxproj,vcxproj.filters,proj,projitems,shproj,props,targets,ruleset,config,nuspec,resx,vsixmanifest,vsct}]
+[*.{aml,asax,ascx,asmx,asp,aspx,axml,config,content,cshtml,csproj,database,datasource,dbml,disco,discomap,dtsx,edmx,exclude,fxcop,htm,html,items,layout,maml,manifest,master,msha,myapp,nunit,nuspec,proj,projitems,props,publishproj,pubxml,rdl,rdlc,resx,ruleset,settings,shfbproj,shproj,sitemap,snippets,soap,svc,svcinfo,svcmap,targets,tasks,tokens,vbhtml,vbproj,vcxproj,vcxproj.filters,vsct,vsixmanifest,vstemplate,webinfo,wsdl,xaml,xamlcfg,xml,xsd,xsl,xslt,xsx}]
 indent_style = tab
 
 # C#/VB settings
@@ -19,46 +19,46 @@ dotnet_sort_system_directives_first = true
 
 # "This." and "Me." qualification.  Use is preferred where true but the lightbulbs tend to show up in places
 # they aren't wanted (within static methods and nameof parameters etc.) so no suggestions are enabled.
-dotnet_style_qualification_for_event = true:none
-dotnet_style_qualification_for_field = false:none
-dotnet_style_qualification_for_method = true:none
-dotnet_style_qualification_for_property = true:none
+dotnet_style_qualification_for_event = true : none
+dotnet_style_qualification_for_field = false : none
+dotnet_style_qualification_for_method = true : none
+dotnet_style_qualification_for_property = true : none
 
 # Language keywords vs framework type names
-dotnet_style_predefined_type_for_locals_parameters_members = true:none
-dotnet_style_predefined_type_for_member_access = false:error
+dotnet_style_predefined_type_for_locals_parameters_members = true : none
+dotnet_style_predefined_type_for_member_access = false : error
 
 # Modern language feature settings
-dotnet_style_coalesce_expression = true:suggestion
-dotnet_style_collection_initializer = true:suggestion
-dotnet_style_object_initializer = true:suggestion
-# Prefer true:error but must support VS 2013/2015
-dotnet_style_explicit_tuple_names = false:none
-# Prefer true:suggestion but must support VS 2013/2015
-dotnet_style_null_propagation = false:none
+dotnet_style_coalesce_expression = true : suggestion
+dotnet_style_collection_initializer = true : suggestion
+dotnet_style_explicit_tuple_names = true : error
+dotnet_style_null_propagation = true : suggestion
+dotnet_style_object_initializer = true : suggestion
 
 # CSharp code style settings
 [*.cs]
-csharp_style_var_elsewhere = false:none
-csharp_style_var_for_built_in_types = false:none
-csharp_style_var_when_type_is_apparent = false:none
+csharp_style_var_elsewhere = false : none
+csharp_style_var_for_built_in_types = false : none
+csharp_style_var_when_type_is_apparent = false : none
 
-# Prefer true:suggestion but must support VS 2013/2015
-csharp_style_expression_bodied_accessors = false:none
-csharp_style_expression_bodied_constructors = false:none
-# Prefer true:suggestion but must support VS 2013/2015
-csharp_style_expression_bodied_indexers = false:none
-csharp_style_expression_bodied_methods = false:none
-csharp_style_expression_bodied_operators = false:none
-# Prefer true:suggestion but must support VS 2013/2015
-csharp_style_expression_bodied_properties = false:none
+csharp_style_expression_bodied_accessors = true : suggestion
+csharp_style_expression_bodied_constructors = false : none
+csharp_style_expression_bodied_indexers = true : suggestion
+csharp_style_expression_bodied_methods = false : none
+csharp_style_expression_bodied_operators = false : none
+csharp_style_expression_bodied_properties = true : suggestion
 
-# Prefer true:suggestion on all of these but must support VS 2013/2015
-csharp_style_conditional_delegate_call = false:none
-csharp_style_inlined_variable_declaration = false:none
-csharp_style_pattern_matching_over_as_with_null_check = false:none
-csharp_style_pattern_matching_over_is_with_cast_check = false:none
-csharp_style_throw_expression = false:none
+csharp_style_conditional_delegate_call = true : suggestion
+csharp_style_deconstructed_variable_declaration = false : none
+csharp_style_inlined_variable_declaration = true : suggestion
+csharp_style_pattern_local_over_anonymous_function = true : suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true : suggestion
+csharp_style_pattern_matching_over_is_with_cast_check = true : suggestion
+csharp_style_throw_expression = true : suggestion
+
+csharp_prefer_simple_default_expression = true : suggestion
+
+csharp_preserve_single_line_blocks = true
 
 # Indentation options
 csharp_indent_block_contents = true
@@ -76,14 +76,20 @@ csharp_new_line_between_query_expression_clauses = true
 
 # Spacing options
 csharp_space_after_cast = false
+csharp_space_after_colon_in_inheritance_clause = true
 csharp_space_after_comma = true
 csharp_space_after_dot = false
 csharp_space_after_keywords_in_control_flow_statements = false
 csharp_space_after_semicolon_in_for_statement = true
 csharp_space_around_binary_operators = before_and_after
+csharp_space_before_colon_in_inheritance_clause = true
 csharp_space_before_comma = false
 csharp_space_before_dot = false
 csharp_space_before_open_square_brackets = false
 csharp_space_before_semicolon_in_for_statement = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
 csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
 csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_declaration_parameter_list_parentheses = false