Port EQMacEmu's Assist Aggro code

This code also allows you to toggle on Tick Pulling (Aggro:AllowTickPulling)
which was a pulling technique (exploit) fixed sometime in 2006

This code also implements assist caps to cut down on trains (5 by default)
Unsure if live what this number is (it exists) or if it's a per NPC basis

An NPC with Assist Aggro will not call for help, only NPCs with Primary Aggro will

common/ruletypes.h

@@ -459,6 +459,8 @@ RULE_BOOL(Combat, ProjectileDmgOnImpact, true) //If enabled, projectiles (ie arr
 RULE_BOOL(Combat, MeleePush, true) // enable melee push
 RULE_INT(Combat, MeleePushChance, 50) // (NPCs) chance the target will be pushed. Made up, 100 actually isn't that bad
 RULE_BOOL(Combat, UseLiveCombatRounds, true) // turn this false if you don't want to worry about fixing up combat rounds for NPCs
+RULE_INT(Combat, NPCAssistCap, 5) // Maxiumium number of NPCs that will assist another NPC at once
+RULE_INT(Combat, NPCAssistCapTimer, 6000) // Time in milliseconds a NPC will take to clear assist aggro cap space
 RULE_CATEGORY_END()
 
 RULE_CATEGORY(NPC)
@@ -494,6 +496,7 @@ RULE_INT(Aggro, PetSpellAggroMod, 10)
 RULE_REAL(Aggro, TunnelVisionAggroMod, 0.75) //people not currently the top hate generate this much hate on a Tunnel Vision mob
 RULE_INT(Aggro, MaxScalingProcAggro, 400) // Set to -1 for no limit. Maxmimum amount of aggro that HP scaling SPA effect in a proc will add.
 RULE_INT(Aggro, IntAggroThreshold, 75) // Int <= this will aggro regardless of level difference.
+RULE_BOOL(Aggro, AllowTickPulling, false) // tick pulling is an exploit in an NPC's call for help fixed sometime in 2006 on live
 RULE_CATEGORY_END()
 
 RULE_CATEGORY(TaskSystem)