MASA, PARAM-MC, SBA paths functions conversion and integration, cleanup of...

MASA, PARAM-MC, SBA paths functions conversion and integration, cleanup of intermediate float conversions

[x] masa_combine_directions, encode_lfe_to_total_energy_ratio function conversion
[x] stereo_tca_enc, ivas_core_pre_proc_front and pre_proc_ivas cleanup
[x] ivas_param_mc_quantize_iccs, ivas_param_mc_quantize_ildx conversion
[x] Fixed point conversion of functions related to quantization of P and pred coeffs, ivas_dirac_param_est_enc
[x] Q documentation for decoder and renderer files