Support Current Office Theme

[oleibman]

A while back, Microsoft introduced changes to the default theme colors and fonts. We are adding support for this new theme so that users can use it easily on new spreadsheets if they wish. (It is already supported when using the Xlsx Reader to load an appropriate file.) The old theme was described by constants COLOR_SCHEME_2013_PLUS_NAME and COLOR_SCHEME_2013_PLUS; these are deprecated in favor of COLOR_SCHEME_2013_2022_NAME and COLOR_SCHEME_2013_2022. The new theme is described by constants COLOR_SCHEME_2023_PLUS_NAME and COLOR_SCHEME_2023_PLUS. PhpSpreadsheet's default theme remains COLOR_SCHEME_2007_2010, to avoid breaking changes.

A third optional parameter $spreadsheet is added to setThemeColorName. If specified, the default font names for the theme will be applied to the default style for the spreadsheet. You can thus use the new theme with its relatively new default Aptos Narrow font. IMHO, that isn't necessarily a good choice, but it is available. MS stores the new font in a different location than other system fonts, and that can lead to portability problems, e.g. if your spreadsheet uses Aptos and you export it to Html, browsers will not be able to find the font and a substitute font will be used.

This is:

• a bugfix
• a new feature
• refactoring
• additional unit tests

Checklist:

• Changes are covered by unit tests
  • Changes are covered by existing unit tests
  • New unit tests have been added
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
• Documentation is updated as necessary

[oleibman]

Scrutinizer new issues relate to the continued use of the deprecated constants. I'm okay with these until the deprecated items are removed.