-don't directly set AllowOverlay Bindable this should be done specifically where needed -remove AllowOverlay Bindable from ButtonSystem -remove unnecessary xmldoc
+ fix Toolbar being toggleable when it shouldn't be able to + allow opening overlays in MenuState.Initial again
Most issues were related to BeginLoopedSequence usage and lack of "this." in front of transform helpers.
Depends on https://github.com/ppy/osu-framework/pull/837
Also ensure chat is hidden when social is displayed and vice-versa.
Tidies up ToolbarModeSelector a lot by using DI.