Also a little review of Dead objects in general.
The old code was calling 'erase' on a large vector, once for
every dead object (which are a lot, especially if you exit or
teleport), causing the whole (large) vector to be copied every
time. The new code only calls erase once per call (about once
a second at most now), erasing 20 to 100 objects at the END
of the vector. This is INCREDIBLY faster.
93fdc2c89e