Float structure members and buffers cleanup

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

MLD scores:
Original inputs:
MLD > 10: 75
MLD > 5 : 143
MLD < 5 : 379

+10dB inputs:
MLD > 10: 208
MLD > 5 : 192
MLD < 5 : 196

-10dB inputs:
MLD > 10: 22
MLD > 5 : 97
MLD < 5 : 478