Don't do physics updates in world generation. Fixes BUKKIT-3747
CRPG Changes

+ Use new PathfinderAI
+ Player name control
+ [Spigot] Optimize chunk unload packet
+ Super metadata
+ Player data pass around

> [Spigot] View radius customization
> [Spigot] Faster Entity UUID
> Change EntityLiving AI to public
> Adjust tab list player cap to 80

- Remove tick, block [fade/spread/growth/leaves decay]
- Remove standard PathfinderAI
- Remove Packet201PlayerInfo calls
- Remove particles for Jump Boost
- Remove relocation