Shift computation to concealment

And references to nnet_data.h

Remove old pitch estimator and retrain all models

Should make synthesis easier in the future

We're back to processing 10 ms at a time and have no need for 40-ms
"superframes".

Add arch to the LPCNet states, but right now it's always set to zero

Calls are deferred to the actual loss and we only process the minimum
required.

Can now inject FEC features to be used by the PLC when available

Jan Buethe authored 2 years ago and Jean-Marc Valin committed 2 years ago

Model now stores LPC gamma, look-ahead, and end-to-end.
Parameters aren't quite reliable yet, YMMV

Causal vs non-causal, DC filter, and blending are now configurable

Makes the offset signal more continuous

Defer some of the extra resync work to the next packet

Remove DC, conceal, add it back at the end