Remove write-only variable anim_flag
Remove write-only array gun_used
Move */main/polyobj.c -> similar/main/polyobj.c
Move */main/object.c -> similar/main/object.c
Remove unused function gr_rle_expand_scanline_generic_masked
Remove unused function ogl_atotexfilti
Remove unused function digi_set_sample_rate
Remove unused function digi_audio_set_digi_volume
Remove unused function digi_audio_set_max_channels
Remove unused function digi_audio_get_max_channels
Remove unused function tex_format_verify
Remove unused functions digi_mixer_set_max_channels, digi_mixer_get_max_channels
Remove unused function show_free_objects
Remove unused function game_expand_bitmap
Remove unused function object_goto_prev_viewer
Remove unused function obj_return_num_of_type
Remove unused function obj_return_num_of_typeid
Remove unused function create_vclip_on_object
Remove unused function remove_incorrect_objects
Remove unused function check_duplicate_objects