Standardise input handling of popup dialogs
Add key bindings for scroll speed
Fix leaderboard showing placeholder briefly when entering song select
# Conflicts: # osu.Game/Rulesets/UI/Scrolling/ScrollingPlayfield.cs
Fix crash if the skin stored in the config doesn't exist anymore
Make BindableRuleset non-null
Fix background screens not supporting early-exit condition
# Conflicts: # osu.Game/Screens/Select/FilterControl.cs
Standardise handling of "Back" key binding
Fix incorrect usages of null coalesce
Extend BeatmapProcessor to allow processing hitobjects prior to ApplyDefaults
Dependency inject the mania column keybind
Fix rulesets not loading in debug builds after running a release build