[BREAKING CHANGE] Popper new signature: seq<IHTMLProp> -> U2<ReactElement list, (PopperProps->ReactElement)> -> ReactElement
[BREAKING CHANGE] MaterialProp.AnchorEl has new type: type AnchorElProp = U2<EventTarget,unit->EventTarget>
MaterialProp.AddEndListener became of type (HTMLElement->(unit->unit)->unit)
Added new props MaterialProp.OnEnter, MaterialProp.OnEntering, MaterialProp.OnEntered, MaterialProp.OnExit, MaterialProp.OnExiting, MaterialProp.OnExited
Added new types: Timeout, TransitionProps, PopperProps