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.
Phpstan level 10 reports an enormous number of errors. So does the excluded missingType.iterableValue. I do not plan to introduce either any time soon. But I will submit piecemeal changes from time to time. Changes will be mostly limited to phpdoc type declarations.
Phpstan hasn't identified any errors in Samples in a long time. But, as it turns out, one particular error is suppressed:
```
Variable $helper might not be defined.
```
This error would be generated by almost all samples, and the errors that it suppresses will become problematic if we move to Level 10. We are not yet committed to doing that, but it is pretty easy to write a script to change the samples so that error no longer happens, and there isn't really any reason to delay doing so. The results of that script constitute this PR.
The samples have become unwieldy when running them from a browser. In particular, the drop-down lists are fixed size with no scrolling, and many of them are now just too large. I have moved all the Calculation samples up a level, and broken several categories (Basic, Chart, DateTime, Engineering, Financial, and Reader) into several pieces.
Convert-Online (now found in the Engineering category) had a number of different problems which are now resolved. It is the only member with any significant code change.
oleibman