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

EVS 26.444 BE test passes.
pytests results: 597 failed, 381 skipped

MLD scores:
Original inputs:
MLD > 10: 82
MLD > 5 : 147
MLD < 5 : 368

+10dB inputs:
MLD > 10: 219
MLD > 5 : 196
MLD < 5 : 182

-10dB inputs:
MLD > 10: 32
MLD > 5 : 92
MLD < 5 : 473