- Increased decoder gpu frame pool size to 64 frames to support
filter graphs (would else result in out of memory errors)

Audio output works perfectly after first tests, even after fast repeatedly pausing and resuming, the audio stays synchronized to the video

 - required for Raspberry Pi OS

 - optimization, cleanup and error reinforcement required
 - started rewriting OpenGLRenderer to use PTS for RenderClock interval instead of the inverse of framerate, because not every stream contains information about framerate

 - Rewrote *.pro for MinGW compilation on Linux for Windows
 - Compilation with MinGW successful

 - Pausing and resuming playback results in very little A-V-Gaps of (n * 1536 samples)
 - Possible fix: Requeueing last audio frame after resume

 - Synchronization between OpenGL renderer and OpenAL output has been massively improved, though it will get out of sync after 2 minutes of playback
 - Synchronization is realized with on RenderClock for both outputs