Fix OsuTooltipContainer.PopIn not overriding PopOut transforms
Remove DragBar and replace with classes that inherit SliderBar
Also use local ariables where possible.
# Conflicts: # osu.Game/Overlays/DragBar.cs
This introduces a new level, so other overlays' depth are changed together.
Fix not applying song select preview seek
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Most issues were related to BeginLoopedSequence usage and lack of "this." in front of transform helpers.