Improvements to change tracking and indexing

[itsWindows11]

Resolved / Related Issues Items resolved / related issues by this PR.

• Fixes #237, #220, #174, #171, #150 and #127.

Details of Changes

• Switched to the StorageLibrary change tracker instead of the folder change tracker, which was unreliable and crashes most of the time because of the path being empty.
• Changes to the music/video library should be handled correctly now.

Validation How did you test these changes?

• [x] Built and ran the app

Screenshots / Videos (optional) No visual changes to show.

[itsWindows11]

I don't know why but GitHub doesn't let me request changes for some reason, but here are the requested changes anyways.

Ooh I forgot that this is my own PR.