* WIP
* put all test related namespaces in a single file
* Add GloblaUsings for System.* namespaces - used everywhere
* Start to move other Windows/Microsoft namespaces to a single file
* Don't include Rider temp/cache files
* Add link to docs explaining global using directives
* xPlatform projects need linked GU_Labs file as don't have a shared props file to reuse
* Update common/GlobalUsings_Tests.cs
Co-authored-by: Michael Hawker MSFT (XAML Llama) <24302614+michael-hawker@users.noreply.github.com>
* Update common/GlobalUsings_Labs.cs
Co-authored-by: Michael Hawker MSFT (XAML Llama) <24302614+michael-hawker@users.noreply.github.com>
* Update common/GlobalUsings.cs
Co-authored-by: Michael Hawker MSFT (XAML Llama) <24302614+michael-hawker@users.noreply.github.com>
* Update GlobalUsings_Labs.cs
* simplify and standardize including GU_Labs
* Remove explicit `using Windows.Foundation;` to try and address CI build failures
* fix duplication of global usings
* Tidy up the CanvasLayout usings
commiting to test wider on the CI
* remove using declarations from SizerBase
* remove using declarations from template
* Add all GlobalUsings to the Solution so easily accessible
* Add license header to GlobalUsings files
* Expand comments explaining the GlobalUsings files
* Don't use a shared "Microsoft.UI.Xaml.Controls" declaration
* Remove duplication from GU_Tests
* Standardize filename pluralization
* centralize declarations for Automation namespaces
* rename GU_Labs > GU_WinUI
* Remove GU_Experiments as unneeded
Co-authored-by: Michael Hawker MSFT (XAML Llama) <24302614+michael-hawker@users.noreply.github.com>