Bit exact optimizations in SBA decoder renderer path

Changes are enabled with macro OPT_SBA_REND_V1_BE

Functions and corresponding WMOPs gains:

ivas_dirac_dec_output_synthesis_process_subframe_psd_ls_fx 1.5

vbap_gains 0.2

vector_matrix_multiply_3x3_fx 2.2

protoSignalComputation4_fx 1.8

in_tri_fx 0.1

Test case:

./IVAS_cod -sba 1 256000 48 scripts/testv/stvFOA48c.wav bit_sba

./IVAS_dec 7_1 48 bit_sba sba.wav