Fix pause/play operation sometimes displaying incorrectly on OSD
Move OsuGame-dependent music functionalities outside of MusicController
Add basic metadata info editing support to editor
Avoid multiple editor screens potentially loading on top of each other
Round the corners of dropdowns when expanded
Rename drag blueprint selection method for discoverability
Avoid requiring sending the calling method for CleanRunHeadlessGameHost
Support creating new empty beatmaps
Lowercase one more toolbar tooltip
Improve usability of BPM modifying in timing setup view
Bring legacy slider border width closer to osu!stable