[rbp] Resume video output on startup
omxrender: Hacks to reduce GUI rendering rate when playing video
rbp: Use new dispmanx function for vsync callbacks
egl: Treat unknown display aspect ratio as square pixel
[dvdplayer] Fix for timestamp correction when no audio or no video

If audio or video track is missing, we don't have to wait for the other track to have a matching timestamp jump
Also compare dts rather than correction values as suggested by FernetMenta
squash: don't update originaldts when marked as invalid
Fix wrongly used CFile::Exists() for directories instead of CDirectory::Exists() Currently it can cause hardly detectable errors as some VFS don't return true when directory is requested for CFile. One of VFS of such kind is Win32File.
Implement PosixFile class for accessing local files on Posix platforms
Switch to new PosixFile
Remove HDFile