The idea here is that the atbx is "unpacked" to ATBX_MASTER and tracked in git. A new .atbx file can be made by zipping the contents of ATBX_MASTER. Changes in the .atbx, such as those made via Arc's ...
Starting from v0.10.0, the WinUIShell namespace structure follows the original namespace structure in the WindowsAppSDK. For example, Button class belongs to the WinUIShell.Microsoft.UI.Xaml.Controls ...