Beatmap import support from osu!stable
Improvements to (progress) notifications
Fix cross-thread notification posting causing a hard crash
Make OsuButtons visually disable when not enabled
Use a transaction when adding a beatmap
Add the ability to create migrations on a per-store level
Fixes flakey unit test.
Fixes a potential threading issue when updating Text.
Posts can be triggered by Logger.Log events which are not guaranteed to be on the update thread.
Also adds an option to delete all beatmaps for testing purposes.
Now stores store versions to the database itself.
Allow ChatOverlay resize only if it dragged by tabs area only