v4.2
[ImgBot] Optimize images (#17293)
Code Quality: Updated headers
Code Quality: Added empty projects for Files.App.Controls and Files.App.UITests (#15784)
Code Quality: Implemented Omnibar (#16910)
Code Quality: Updated license header
Code Quality: Fixed typo in Files.App.UITests.csproj (#17652)
Code Quality: Add ThemedIcon gallery page to UI test app (#18411)