Added *CurrentCam to st_room for future rendering functions and added the functions st_entity_slots_open, st_entity_slots_open_first, st_entity_slots_taken, and st_entity_slots_taken_last as quality of life improvements.
Added *CurrentCam to st_room for future rendering functions and added the functions st_entity_slots_open, st_entity_slots_open_first, st_entity_slots_taken, and st_entity_slots_taken_last as quality of life improvements.

BtheDestroyer/SpriteTools,BtheDestroyer/SpriteTools