Unload entities in worlds w/o players
Added logging for entity spawning/despawning/death
Added logging for chunk loading/unloading
Added MCPC+ command to change config settings at runtime (/mcpc get|set)
Added *basic* option to find worst "stacked" entities per world (/mcpc collision)
Added *basic* option to kill worst "stacked" entities per world (/mcpc collision kill)