Integration of fixed point sub-functions 13.

[x] ivas_ism_dec_digest_tc fixed point changes.
[x] Add changes related to conversion of ivas_param_ism_params_to_masa_param_mapping.
[x] ivas_mdct_core_reconstruct function fixed point changes.
[x] Intermediate float-to-fixed and fixed-to-float conversions cleanup.
[x] Add integeration changes for subfunctions of ivas_init_decoder.
[x] Added changes to commonize structs in orient_trk.
[x] Shoebox functions in fixed point
[x] Fix for issues #712 and #713
[x] Fix added for crashes observed in renderer pytest.