Add basic UO support (now called Audio Offset).
Tidies up ToolbarModeSelector a lot by using DI.
Taiko fixes
Update score to read statistics from server.
Tooltips
Also brings some naming up-to-date.
# Conflicts: # osu.Game/Graphics/UserInterface/OsuSliderBar.cs
Don't play sliderbar samples more than once when value has not changed.
Handles drag operations better.