Small inregion optimization
Be slightly safer about saving files from the server
Updated resources to 1.6

Fixes:
  Events:  Damage, Spawn, Heal event errors.
  Routines: Heal, Spawn, Hurt, UnknownHurt
  Properties: Entity Health
Add support for horses.

Added HorseJump event
Added horse properties:
  horsecolor, variant, style, domestication,
  maxdomestication, jumpstrength, haschest
playernamed and worldnamed functions that should be easier to use than playernamed_* and worldnamed_*
Avoid potential NPE