Move user-facing strings to resource files

[j0shuams]

This PR introduces resx and rc files for user-facing strings in the C#/WinRT toolchain. These are error messages from various tools we use - WinRT.Host, WinRT Authoring Diagnostics, and WinRT.Runtime. Included in these changes is logic in the respective projects to load resource strings from these resource files.

We will need to add a TDBuild task to our CI YML templates, and properly package the resulting localized files. Some of the code used for loading will need to be updated to find the language/region specific versions of the resource files.

TDBuild onboarding deliverable: https://globalcollaborationservice.visualstudio.com/Global%20Collaboration%20Service%20Project/_workitems/edit/106432

[j0shuams]

Per discussion with Ben, I'm looking into using .mui files instead of the satellite dll for winrt.host errors

[manodasanW]

Whats the story here for localized ones if en-us is the main one copied Is it up the component owners to pack the others based on which ones they want? Same for below where you use en-us.

[j0shuams]

Yeah I think automating minimally is better in this case so we don't always output many binaries in their project. The different culture/regions will be available in the nupkg, so they can distribute the whole lot if they want. But we will just handle en-us for them, for now. If we get feedback from folks that they prefer a different model we can adjust accordingly.