Codecs fixes as of October, 25, 2014

Removed ophint.h and global excessive typedefs from ophmconsts.h.

amr, bv, codec2, g723, g729, gsmhr, ilbc: memzero rearrangement and underflow fixes.

amr, bv, g723, g729, ilbc: replace (U)WordN//FloatN and similar crap with standard types.

bv: removed memutil.

codec2: replaced alloca() with VLA, fixed zero pointer and garbage values dereferencing.