MainFrm: Immediately switch to the normal preset when Esc is pressed when the caption is hidden.
Revert "Call ToggleD3DFullscreen from GraphThread if it is active."

This reverts commit f6c1126aeff2f00e7e45427efaa7cb998ec8f55a.
MainFrm: Move creation/destruction of CFullscreenWnd to the Main Thread.