Make D3DFullscreen behave like regular fullscreen when losing focus.

It reports the application that we're switching to and exit fullscreen. This does mean SendSatusMessage() must be made public, but that makes sense and should be safe.
Semi-automatically updated resource files to reflect the changes.
MainFrm: Fix strange D3DFullscreen focus behaviour when always on top is enabled.
Updated changelog
DX9AllocatorPresenter: Reuse the EVR Fullscreen focus window if it is found.

Also, don't allow D3D to change the window style. This fixes the loss of focus when D3DFullscreen is active.