Investigate Template Parameters

Investigate if the https://github.com/dotnet/templating system allows us to pass in parameters to modify the generation.

Default would still be everything included.

We'd want to have a flag which can either:
- remove the templated control added in CommunityToolkit/Labs-Windows#157 CommunityToolkit/Labs-Windows#160
- generate a .NET Standard source library/unit test project instead (remove PackageIdVariant and MultiTarget lines from csproj)

Start by reviewing the dotnet/templating system and the changes referenced in CommunityToolkit/Labs-Windows#157 and #160. Determine whether template parameters can support the requested flag and both generation modes. Done means documenting the supported approach and defining how the default, control-removal, and .NET Standard source-library/unit-test outputs should behave.

Scritto dal modello di indicizzazione a partire dal testo della issue.