Make an actual system for taking damage that has a non-enemy source.

[vesper-arch]

So far there is only a super rudimentary Player.take_sourceless_dmg() function that is separate from the attack functions. I would like to change the way damage is handled in a way that allows damage to be applied cleanly. My best guess as to what might solve it is instead of having the attack function target the something, they just let the entity take damage.