[FFmpeg-soc] AAC TNS encoder

[Alex Converse]

The following patchset adds TNS support to the AAC encoder.

It's not 100% ready to be integrated.

Patch 0 adds PARCOR code from Flake and doesn't have much to do with AAC.
Patch 1 moves some AAC stuff around but doesn't ahev much to do with encoding.
Patch 2 adds TNS support.
Patch 3 adds a TNS coefficient compressor that shouldn't effect the
output of the file after encoding and decoding but does for reasons
taht stump me at the moment. Any help on this one would be greatly
appreciated.

Regards,

Alex Converse
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