Add support for .RESW files

[mrlacey]

Currently, only .resx files are supported.
.resw files have the same internal structure and so should be easy to support. However, the way they are used in code makes their usage harder to identify.

Add support if a simple way to identify their usage can be identified.
This may require more complicated code analysis than just string matching. I originally looked at this for resx support too but it is much more complicated and there are many errors and edge cases to consider.

[mrlacey]

Make running on *.resw files an optional setting that is disabled by default.

Can use ResXFileCodeGenerator as a Custom Tool on .resw files.

[mrlacey]

For easy reference:
https://docs.microsoft.com/en-us/windows/uwp/app-resources/localize-strings-ui-manifest
https://platform.uno/docs/articles/using-uno-ui.html#localization
https://stackoverflow.com/questions/62196550/is-there-one-syntax-for-all-platforms-to-use-localized-resources-from-resw-file

[michael-hawker]

Use in code may be tricky, but just having a XAML preview (or even just link to bring that row up in the resw editor) would be handy.