Added a hypodermic acorn hazard, which works like the stalactite except it tracks you. Note that this sort of makes stalactites weak sauce, since it's intended to be a forestier enemy.
This entailed an update to falling_harmful.cfg, which was prototyped from stalactite.cfg. It now works even if you do move the object after creation.
Added two new functions to lib.math. Loop makes the number loop around, like in a circle, and in_range returns true if a <= b <= c.