MainFrm: Immediately switch to the normal preset when Esc is pressed when the caption is hidden.
Move creation/destruction of CFullscreenWnd to the Main Thread.

This reverts commit f6c1126aeff2f00e7e45427efaa7cb998ec8f55a.
Put LAVFilters files in a different folder when using x64.
Update installer.

Delete old LAVFilters for the x64 build.