Monsters: Allow fine-grained control over how monsters can re-spawn
Currently, mappers can only set a spawnflag to decide whether a monster will or won't re-spawn (assuming it hasn't been gibbed). It would be nice to be able to control the following (and possibly more):
- Whether monsters are forced to re-spawn, regardless of whether or not they were gibbed
- The ability to toggle re-spawning or forced re-spawning via some kind of entity or flag