Fix pressing escape quickly unexpectedly exiting gameplay
Fix ApproachRate not inheriting OverallDifficulty when it is undefined
Improvments to EF context handling and BeatmapManager
Fade slider ticks with hidden mod
Add confirmation dialog to Delete in beatmap context menu
Also add finaliser logic for safety. Also better threading. Also more cleanup.
Cleans up a lot of code, removes handles for now.
Anyone that may have benefited from this already has.
Not yet working