lib_rend functions conversion, MSAN fixes in SBA path

[x] renderism functions conversion
[x] SBA path MSAN error fixes
[x] ivas_masa_merge.c BASOP changes

EVS 26.444 BE test passes.
pytests results: 588 failed, 381 skipped

MLD scores:
Original inputs:
MLD > 10: 110; Out of these, 51 cases are PLC
MLD > 5 : 123
MLD < 5 : 365

+10dB inputs:
MLD > 10: 220
MLD > 5 : 190
MLD < 5 : 188

-10dB inputs:
MLD > 10: 74
MLD > 5 : 73
MLD < 5 : 451