This commit first and foremost ports the -tg- atom pooling system, and
removes the old experimental system entirely.
Secondly, this PR modifies the qdel system to use a -tg- lookalike
"destroy hint" system, which means that individual objects can tell qdel
what to do with them beyond taking care of things they need to delete.
This ties into the atom pooling system via a new hint define,
QDEL_HINT_PUTINPOOL, which will place the atom in the pool instead of
deleting it as per standard.
Emitter beams are now fully pooled.
Qdel now has semi-compatibility with all datum types, however it is not
the same as -tg-'s "Queue everything!" system. It simply passes it through
the GC immediately and adds it to the "hard del" lists. This means that
reagents can be qdel'ed, but there is no purpose as of yet, as it is more
or less the same as just deleting them, with the added effect of adding
logs of them being deleted to the garbage collector.
This commit adds a small sanity check to the falloff calculations of
lights, to prevent them from dividing by 0. This may cause undiscovered
strangeness, but strangeness is better than filling the runtime log.
This commit also fixes the supply shuttle, which was not spawning any
ordered items. It did this because it had a very basic contents.len check
which the lighting overlays triggered. The sanity check to not spawn stuff
on top of other stuff is now a for(atom) loop on the turfs, which has
snowflake checks for lights and lighting overlays.
