Our SSOverlays system is outdated, and is likely the cause of many of
the issues seen in #18895. It has also been linked to a massive server
performance decrease.
This brings an updated system from Baystation, hopefully with speed
increases.
Should be testmerged, ideally with #18895.
---------
Co-authored-by: Cody Brittain <cbrittain10@live.com>
* Refactored do_after to use a flag-based system for options
* More flags
* Ditto
* Use the HAS_FLAG macro
* do_after pass
* Fix burning paper code
* Resolve issues from Fluffy's code reviews
* .
