NPCs should no longer warp when fleeing.

Added fleespeed to #showstats when an NPC is fleeing.

Changed NPCs spell recast timing.

recast_delay = -2 no delay at all, be very careful with this!
recast_delay = -1 (default) NPC will use spell recast time.
recast_delay = 0 NPC will only use a randomly selected delay.
recast_delay > 0 NPC will use this delay instead of the normal spell recast time.

I also added a rule: Spell:NPCUseRecastVariance which adds a variance when recast_delay > 0. This can be set per zone if needed.