VideoRenderers: Set m_bPendingResetDevice flag before resetting the device after a video window switch.
MainFrm: Move D3DFS display mode switching to ToggleD3DFullscreen().

Also use the normal way of determining the frame rate instead of using the method based on MediaInfo.
AppSettings: Only return true for IsD3DFullscreen() if it is actually supported.
MainFrm: Remove renderer check which is now always redundant.
MainFrm: Fix starting in fullscreen when D3DFullscreen is enabled.
MainFrm: Hide the cursor when starting in remembered fullscreen for consistency.
MainFrm: Remember last fullscreen state when using D3DFullscreen.
CVMROSD: Fix OSD message not being removed after switching the video window.
CVMROSD: Get the lock before changing the video window.
Remove message about D3DFullscreen restart requirement.
Remove OSD D3DFullscreen reminder.
Remove madVR D3DFullscreen support, it isn't useful.

Exclusive mode is handled internally in the renderer.
Remove messages about Ctrl+C being the only way to exit D3DFullscreen.
AppSettings: Disabled D3DFullscreen hotkey by default.

Now that users can switch between windowed and D3DFullscreen during playback a toggle hotkey doesn't have to be provided by default anymore.
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