* Some explosions code cleanup (#57493)
Clears out two deprecated explosions systems (explosion ids and explosion levels)
Refactors a bunch of contents_explosions procs to be maybe slightly faster.
Cleans up a bunch of ex_act code.
Slightly cleaner code
A few less unused vars on /atom and /turf
* Some explosions code cleanup
Co-authored-by: TemporalOroboros <TemporalOroboros@gmail.com>