[Vcxproj] Promote Custom target elements to Project level so it can also be used in vcxproj. This was mainly needed to be able to suppress auto generation of AssemblyAttributes.cpp in clr projects:

[More info](https://stackoverflow.com/questions/3104356/in-visual-studio-2010-why-is-the-netframework-version-v4-0-assemblyattributes-c)

Author: kudaba

Sharpmake.Generators/VisualStudio/Vcxproj.Template.cs

@@ -462,6 +462,15 @@ internal static class Filters
 ";
                 }
             }
+
+            public static class TargetElement
+            {
+                public static string CustomTarget =
+@"  <Target Name=""[targetElement.Name]"" [targetElement.TargetParameters]>
+    [targetElement.CustomTasks]
+  </Target>
+";
+            }
         }
     }
 }

Sharpmake.Generators/VisualStudio/Vcxproj.cs

@@ -676,6 +676,15 @@ private void GenerateImpl(GenerationContext context, IList<string> generatedFile
             }
             fileGenerator.Write(Template.Project.ProjectTargetsEnd);
 
+            foreach (var element in context.Project.CustomTargets)
+            {
+                using (fileGenerator.Declare("project", context.Project))
+                using (fileGenerator.Declare("targetElement", element))
+                {
+                    fileGenerator.Write(Template.TargetElement.CustomTarget);
+                }
+            }
+
             // in case we are using fast build we do not want to write most dependencies
             // in the vcxproj because they are handled internally in the bff.
             // Nevertheless, non-fastbuild dependencies (such as C# projects) must be written.

Sharpmake/Project.cs

@@ -223,8 +223,27 @@ internal void Resolve(string sourceRootPath, Resolver resolver)
 
         public XResourcesImgContainer XResourcesImg = new XResourcesImgContainer();
 
+        [Resolver.Resolvable]
+        public class CustomTargetElement
+        {
+            public string Name = "";
+            public string TargetParameters = "";
+            public string CustomTasks = "";
+
+            public CustomTargetElement()
+            { }
+
+            public CustomTargetElement(string name, string targetParameters, string customTasks)
+            {
+                Name = name;
+                TargetParameters = targetParameters;
+                CustomTasks = customTasks;
+            }
+        }
+
         public Strings CustomPropsFiles = new Strings();  // vs2010+ .props files
         public Strings CustomTargetsFiles = new Strings();  // vs2010+ .targets files
+        public List<CustomTargetElement> CustomTargets = new List<CustomTargetElement>();
 
         public Strings LibraryPathsExcludeFromWarningRegex = new Strings();                 // Library paths where we want to ignore the path doesn't exist warning
         public Strings IncludePathsExcludeFromWarningRegex = new Strings();                 // Include paths where we want to ignore the path doesn't exist warning
@@ -2160,7 +2179,7 @@ public static void InitAspNetProject(this CSharpProject aspNetProject)
 
             aspNetProject.NoneExtensions.Add(".pubxml");
 
-            aspNetProject.CustomTargets.Add(new CSharpProject.CustomTargetElement()
+            aspNetProject.CustomTargets.Add(new Project.CustomTargetElement()
             {
                 Name = "MvcBuildViews",
                 TargetParameters = @"AfterTargets=""AfterBuild"" Condition=""'$(MvcBuildViews)' == 'true'""",
@@ -2311,7 +2330,6 @@ public class CSharpProject : Project
         public List<ComReference> ComReferences = new List<ComReference>();
         public List<ImportProject> PreImportProjects = new List<ImportProject>();
         public List<ImportProject> ImportProjects = new List<ImportProject>();
-        public List<CustomTargetElement> CustomTargets = new List<CustomTargetElement>();
         public List<UsingTask> UsingTasks = new List<UsingTask>();
 
         public bool? WcfAutoStart; // Wcf Auto-Start service when debugging
@@ -2336,24 +2354,6 @@ public class CSharpProject : Project
         /// </summary>
         public bool GenerateDocumentationFile = false;
 
-        [Resolver.Resolvable]
-        public class CustomTargetElement
-        {
-            public string Name;
-            public string TargetParameters;
-            public string CustomTasks;
-
-            public CustomTargetElement()
-            { }
-
-            public CustomTargetElement(string name, string targetParameters, string customTasks)
-            {
-                Name = name;
-                TargetParameters = targetParameters;
-                CustomTasks = customTasks;
-            }
-        }
-
         [Resolver.Resolvable]
         public class UsingTask
         {