[Localization] Move rc files to resx

[arjunbalgovind]

Summary of the Pull Request

What is this about?
This PR adds in the following two scripts for resource conversion:

• convert-resx-to-rc.ps1: To convert resx files in a folder to a single rc file with language specific conditioning. This will be run pre-build for each C++ project with rc file.
• convert-stringtable-to-resx.ps1: To convert a file containing the rows of a string table to a resx file. Since this script is to be used only once while creating the resx file the script is not very robust, i.e. the input is required in a very specific format.

In addition to the scripts, resx files have been added and rc files replaced for the following projects:

• ColorPicker (C++)
• ImageResizerExt
• Microsoft.Launcher (C++)
• Keyboard Manager
• powerpreview

For the above projects, LocProject.json files were added to enable CDPX localization

PR Checklist

• Applies to [Localization] Migrate C++ project resources to resx files and set up scripts to convert to rc file at build time #6055
• CLA signed. If not, go over here and sign the CLA
• Tests passed

Info on Pull Request

What does this include?

• The conversion script uses resgen which is a VS tool to extract the resources from a resx to a plaintext file and vice versa.
• The resx to rc file script reads all the resx files in the argument directory and adds in string tables to a base rc file, and adds the language specific rc file syntax based on the resx file name. The language identifiers have been hardcoded in, since localization will be done on a limited set of languages and PowerShell doesn't have appropriate APIs to auto-generate this information.
• The files are added to a Generated Files folder so that they are skipped by .gitignore
• A base resource.h and base rc file is required in order to add any basic syntax for the file as well as non-localizable resources.
• The script generates new .h and .rc files by adding the string tables to these base files in the generated files folder.
• The script has try-catch blocks in case a file read/write fails because of the file being in use by another process (such as VS)
• The script checks if the content to be written to the file is different from the existing file to avoid rewriting. This avoids unnecessary building of files which use resources when there is no file change on incremental builds.

Pending work

• The same work will be done for FZ, PowerRename and SG in separate PRs to avoid conflicts with other PRs.

Validation Steps Performed

How does someone test & validate?

• Validated that the solution builds, and the installer builds.
• Validated that existing French resources in ImageResizerExt are loaded on switching OS language
• Validated with a duplicate resx file for French with a few strings modified that it works for Keyboard Manager as well.
• Validated that english strings are loaded as a fallback when using French OS language if the resources dont exist.
• Validated on CDPX pipeline that all the localized resx files are created, and the MSI works as expected

[enricogior]

I would suggest to split this PR since we have work in progress with FZ and this needs to be coordinated to minimize conflicts.

[arjunbalgovind]

I would suggest to split this PR since we have work in progress with FZ and this needs to be coordinated to minimize conflicts.

I will limit the changes in this PR to all the modules except FZ, PowerRename and Shortcut Guide. Once this is complete I'll make separate PRs for them.

[enricogior]

@arjunbalgovind
is the PR ready for review?

[arjunbalgovind]

@arjunbalgovind
is the PR ready for review?

@enricogior yes it can be reviewed now

[ryanbodrug-microsoft]

LGTM!