v4.0.21
[ImgBot] Optimize images (#17293)
Code Quality: Brushed up Omnibar and BreadcrumbBar (#16973)
Code Quality: Added empty projects for Files.App.Controls and Files.App.UITests (#15784)
Feature: Moved Settings button to the Sidebar (#16911)
Code Quality: Ran code cleanup (#17307)
Code Quality: Implemented Omnibar (#16910)
Code Quality: Updated license header
Code Quality: Fixed typo in Files.App.UITests.csproj (#17652)
Code Quality: Implemented Breadcrumb (#16946)