omasa_ana, masa_merge conversion and lib_rend.c cleanup

[x] lib_rend.c float dependencies cleanup
[x] Functions in ivas_omasa_ana.c converted to fixed point.
[x] Functions in ivas_masa_merge.c converted to fixed point.
[x] Few other miscellaneous cleanup.

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

MLD scores:
Original inputs:
MLD > 10: 126; Out of these, 51 cases are PLC
MLD > 5 : 100
MLD < 5 : 362\

+10dB inputs:
MLD > 10: 319
MLD > 5 : 112
MLD < 5 : 157

-10dB inputs:
MLD > 10: 70
MLD > 5 : 72
MLD < 5 : 446