hoa gain matrix and bin renderer changes.

[x] Contains changes for conversion of 3 subfunctions used in binRenderer_internal.c along with changes to accomodate fixed buffers (hoa_gain_matrix).

Pytests: 573 failed, 381 skipped and 1 passed for original inputs, +10dB scaled and -10dB scaled inputs.

MLD:
Original: 6 cases > 5
8.623271 9.196089 10.831767 10.85423 12.952374 22.458605

+10dB: 20 cases > 5
5.371162 5.505808 5.522441 5.572725 5.663041 5.663041 6.294526 6.992575 9.476715 10.755767 10.755767 14.898525 16.605692 16.975687 19.353098 19.374313 19.763744 23.681921 27.03828 38.924347

-10dB: 5 cases > 5
5.966279 6.010706 8.76452 15.850233 24.995966