[revert] changes related to FIX_INV_DIFFUSE_WEIGHT,...

[revert] changes related to FIX_INV_DIFFUSE_WEIGHT, FIX_638_ENERGIE_IAC_ROM_TABLES, FIX_20_MS_FRAME_LEN_TABLES_CONVERTER and FIX_HOA_BRIR_EXT_RENDERER - contained in 744_step3_code_changes