Warnings fix for float-build, intermediate float conversions cleanup in renderer

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

MLD scores:
Original inputs:
MLD > 10: 81
MLD > 5 : 139
MLD < 5 : 377

+10dB inputs:
MLD > 10: 214
MLD > 5 : 189
MLD < 5 : 193

-10dB inputs:
MLD > 10: 28
MLD > 5 : 98
MLD < 5 : 471