Added new commands to make it easier to use bytes objects to load and work with data.

• Added: create_memblock_from_bytes
• Added: create_memblock_id_from_bytes
• Added: set_memblock_bytes
• Added: get_memblock_bytes
• Added: get_image_rgba_bytes
• Added: create_image_from_rgba_bytes
• Added: create_image_id_from_rgba_bytes
• Added: create_image_from_png_bytes
• Added: create_sound_from_raw_bytes
• Added: create_sound_id_from_raw_bytes
• Added: create_sound_from_ogg_bytes
• Added: create_sound_id_from_ogg_bytes
• Added: create_music_from_ogg_bytes
• Added: create_music_id_from_ogg_bytes
• Added: add_object_mesh_from_bytes
• Added: create_object_from_mesh_bytes
• Added: create_object_id_from_mesh_bytes
• Added: set_object_mesh_from_bytes
• Changed: get_image_width now returns int instead of float
• Changed: get_image_height now returns int instead of float