Memory Leak

[goweiwen]

There seems to be a memory leak in a hashmap in ProfilerStatsMonitor. After an uptime of ~12 hours and ~10 active players, a hashmap in the class takes up a whooping 500MB of memory.

Skimming the code, it looks like we're populating a hashmap inside the stats attribute for each loaded chunk without clearing the hashmap. One way to fix this would be to listen on ChunkUnloadEvent and remove stale entries.