Stereo, OMASA LTV crash fixes, Float buffer cleanup

[x] Stereo LTV crash issues fixed:
    [stereo at 13.2 kbps, 32kHz in, 32kHz out, DTX on, random FER at 5%, bandwidth switching]
    [stereo bitrate switching from 13.2 kbps to 128 kbps, 32kHz in, 32kHz out]
[x] OMASA LTV crash issues fixed:
    [OMASA 1Dir1TC 4ISM at br sw techs 13.2 to 512 kbps start 32 kbps, 48kHz in, 48kHz out, BINAURAL out, FER at 5%]
    [OMASA 1Dir1TC 4ISM at br sw techs 13.2 to 512 kbps start 32 kbps, 48kHz in, 48kHz out, BINAURAL out, JBM Prof 5]
    [OMASA 2Dir2TC 3ISM at br sw techs 13.2 to 512 kbps start 160 kbps, 48kHz in, 48kHz out, MONO out, JBM Prof 5]
[x] Float buffers removal and cleanup changes