Unused functions

The following functions are not used in the framework. Some can be removed, some others might need a review for potential future use.

Severity Code	         Description	                                                        Project	   File	                         Line
- [X] Warning	 unused function  'unpack_bit' [-Wunused-function]	                                lib_com	  ..\lib_com\bitstream.c	 101	
- [X] Warning	 unused function  'read_indices_mime_handle_dtx' [-Wunused-function]	                lib_com	  ..\lib_com\bitstream.c	 2249	
- [X] Warning	 unused function  'read_indices_mime_handle_sti_and_all_zero_bits' [-Wunused-function]	lib_com	  ..\lib_com\bitstream.c	 2401	
- [X] Warning	 unused function  'ivas_fb_mixer_get_band_diff_non48k' [-Wunused-function]	        lib_com	  ..\lib_com\ivas_fb_mixer.c     52	
- [X] Warning	 unused variable  'bandOffsetBottom' [-Wunused-variable]	                        lib_com	  ..\lib_com\tec_com.c	         749
- [X] Warning	 unused function  'ivas_get_band_differential_index' [-Wunused-function]	        lib_enc	  ..\lib_enc\ivas_spar_md_enc.c  73	
- [X] Warning	 unused function  'init_fastconv_HRTF_handle' [-Wunused-function]	                lib_util  ..\lib_util\hrtf_file_reader.c 943
- [X] Warning	 unused function  'parseUint16' [-Wunused-function]	                                renderer  ..\apps\renderer.c	         339
- [X] Warning	 unused function  'unpack_bit' [-Wunused-function]	                                lib_com	  ..\lib_com\bitstream.c         101