Fix CEGUI rendering after calling changeScreenMode()
Fix CEGUI rendering after calling changeScreenMode()

enableExtraStateSettings(true) fixes a problem where CEGUI would render "behind" the map for some reason instead of on top as it should.
notifyDisplaySizeChanged() resizes the GUI to the new size.

fifengine/fifengine,fifengine/fifengine,fifengine/fifengine