Performance boost (exponential) - Adjusted default idle cast check timers in rules

- NPC:NPCToNPCAggroTimerMin	500 (Now 6000) 6 seconds
	- NPC:NPCToNPCAggroTimerMax	2000 (Now 60000) 60 seconds
	- Database version 9089 will take care of this update automatically only if you used the default values
	- The CPU cost of NPC's checking the entire entity list to cast beneficial spells (Heals/Buffs) becomes extremely high when
		higher NPC count zones exist (Based off of process profiling)
			- Distance checks for every single NPC to every single other NPC who are casting beneficial spells occur every .5 - 2 seconds unless
				npc_spells dictates other values, which most of the time it does not
	- Zones that once fluctuated from 1-8% CPU with no activity (Idle but players present) now idle at .5% based on my testings due
		to this change in conjunction with the past few performance commits, these are zones that have 600-800 NPC's in them
	- These values normally are overidden by the spells table (npc_spells), fields (idle_no_sp_recast_min, idle_no_sp_recast_max)

utils/sql/git/required/2015_11_02_ai_idle_no_spell_recast_default_changes.sql

@@ -0,0 +1,2 @@
+UPDATE `rule_values` SET `rule_value` = '6000' WHERE `rule_value` = '500' AND `rule_name` = 'Spells:AI_IdleNoSpellMinRecast';
+UPDATE `rule_values` SET `rule_value` = '60000' WHERE `rule_value` = '2000' AND `rule_name` = 'Spells:AI_IdleNoSpellMaxRecast';