[Cin] truehd patches from ffmpeg git

[Andrew Randrianasulu]

so.. patches mostly applicable to ffmpeg-4.4 while I slightly edited 'last
frame' fix due to other ffmpeg changes

apply 'last frame' and '24-bit' for encoding truehd hopefully lossless
apply two mlpdec patches for more correct decoder flush/crc check

try to apply mlp.h and libavformat patches for timestamps in demuxer...

stop-returning-empty for mlpenc not tested.

after all this patching both ffmpeg and cin should work better with truehd
streams (still require 'strict -2' in profile)

there were other fixes and code movements but i hope those patches can fix
real bugs and allow losless re-encoding between pcm and truehd (check
crc's!)
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