…te namespace to CommunityToolkit.WinUI.Controls

Removes Mouse Extension from XAML Template and does in code-behind as to remove the need to set the Cursor property directly via binding
By setting the Cursor DependencyProperty we were losing our detection mechanism, now if it's set it's an explicit override, otherwise we use our logic based on Orientation property
Also, switches to new CommunityToolkit.*.Extensions Dependency vs. old copies of Tree helpers
Fixes some doc typos
Bumps version, tested on UWP, WASDK, and Uno.UI/WASM

* Adding modern style

* Address feedback

* Fixing wrong state names