Added an improved format for entity data (PackedEntity).
Some general tweaks and fixes to the metadata system.
Changed net dirty state to be tracked per component.
Changed the replication mechanism of components, components now have to explicitly annotated to be replicated when added/removed, or contain a replicated field.
Changed a bunch of Multimap fields to correctly be SetMultimaps (as per guava usage recommendations)
Fixes for use and attack network events.