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

zone/mob.h

@@ -504,6 +504,10 @@ public:
 	Mob* GetHateRandom() { return hate_list.GetRandomEntOnHateList();}
 	Mob* GetHateMost() { return hate_list.GetEntWithMostHateOnList();}
 	bool IsEngaged() { return(!hate_list.IsHateListEmpty()); }
+	bool HasPrimaryAggro() { return PrimaryAggro; }
+	bool HasAssistAggro() { return AssistAggro; }
+	void SetPrimaryAggro(bool value) { PrimaryAggro = value; if (value) AssistAggro = false; }
+	void SetAssistAggro(bool value) { AssistAggro = value; if (PrimaryAggro) AssistAggro = false; }
 	bool HateSummon();
 	void FaceTarget(Mob* MobToFace = 0);
 	void SetHeading(float iHeading) { if(m_Position.w != iHeading) { pLastChange = Timer::GetCurrentTime();
@@ -993,6 +997,11 @@ public:
 	void ApplyAABonuses(const AA::Rank &rank, StatBonuses* newbon);
 	bool CheckAATimer(int timer);
 
+	int NPCAssistCap() { return npc_assist_cap; }
+	void AddAssistCap() { ++npc_assist_cap; }
+	void DelAssistCap() { --npc_assist_cap; }
+	void ResetAssistCap() { npc_assist_cap = 0; }
+
 protected:
 	void CommonDamage(Mob* other, int32 &damage, const uint16 spell_id, const SkillUseTypes attack_skill, bool &avoidable, const int8 buffslot, const bool iBuffTic, int special = 0);
 	static uint16 GetProcID(uint16 spell_id, uint8 effect_index);
@@ -1293,6 +1302,11 @@ protected:
 	glm::vec4 m_CurrentWayPoint;
 	int cur_wp_pause;
 
+	bool PrimaryAggro;
+	bool AssistAggro;
+	int npc_assist_cap;
+	Timer assist_cap_timer; // clear assist cap so more nearby mobs can be called for help
+
 
 	int patrol;
 	glm::vec3 m_FearWalkTarget;