MP1-4423: Fixed Memory Leaks in Bass Player
MP1-4423: In some cases the GCHandle was freed to early, causing crashes.
MP1-4431 : Free left GCHandle (ffdshow).
Merge remote-tracking branch 'remotes/upstream/MP1-4423-BUG-Memory_leak_in_BASS_Player' into 1.7.0Fork-BDJ
Merge remote-tracking branch 'remotes/upstream/MP1-4431-BUG-Memory_leak_in_ffdshow_post-processing' into 1.7.0Fork-BDJ