Merge branch 'refs/heads/master' into dependency-injection
# Conflicts:
# osu-framework
# osu.Game/GameModes/OsuGameMode.cs
# osu.Game/GameModes/Play/Player.cs
# osu.Game/OsuGame.cs
# osu.Game/Overlays/MusicController.cs
# osu.Game/Overlays/Options/EditorSection.cs
# osu.Game/Overlays/Options/Input/MouseOptions.cs
# osu.Game/Overlays/Options/Online/InGameChatOptions.cs
# osu.Game/Overlays/Options/SkinSection.cs