Properly handle d3dfs mouse capture and leave
Fix DXVA status for some decoders after 4a79186.

Checking status only once is not reliable.
Even LAV Video Decoder can disable HW decoding on fly except DXVA Native mode.

Fixes #3881
Show tooltip with HW decoder name in status bar.

Fixes #3873
Statusbar: fix some visual glitches
VideoRenderers: comment out asserts from 8d2b621

I wouldn't dare to add locks there so close to the stable
MainFrame: override default MFC Alt key behavior

Refs #3956