Topic: Host 661 changes

Blank aggro data sent to client to clear client correctly.
Aggro data vector now populated only if needed.
Interrupt delay now sent to client.
All players of a group in an instance area now gain small amount of aggro on all aggro generated, providing that player is near by.
Aggro data now cleared correctly when a player dies, due to the above change.
Summons will now correctly follow players into instanced areas.
New resilience attribute will now reduce chance to be interrupted.
Resist psion renamed too Resilience.
Resistance attribute renamed to Resilience.