* Remove threading from the drawers
* Fix some r_scene_multithreaded related bugs
* Fix some r_scene_multithreaded crashes
* Fix fullbright shade bug
* Fix truecolor drawer crash
* Add debug code for showing the render slices
* Fix texture loading race condition and improve performance by only locking the load mutex if data hasn't already been updated for this frame
Co-authored-by: Magnus Norddahl <dpjudas@users.noreply.github.com>