Codecs fixes as of October, 27–29, 2014

Trivial fixes: bv, gsmer, gsmhr, ilbc, lpc.

Massive bugfixing: lpc10 (to be continued due to completely shit-code).

Massive code rework: opus (ability to choose between fixed/floating-point, see libcodecs/opus/Makefile; coding style rework, redundant code removal, overall small bugfixes and cleanups).