Rule to make player cast swarm pets untargetable with F8.

New npc_types field to allow any NPC to be untargetable with F8
Swarm pets will now be heal/buffable like live.
See change log for more details.

Note: The method used here to prevent
targeting is a hack but the only side
effect it turns affected NPC's names Yellow.

zone/mob.h

@@ -170,7 +170,7 @@ public:
 	bool IsInvisible(Mob* other = 0) const;
 	void SetInvisible(uint8 state);
 	bool AttackAnimation(SkillUseTypes &skillinuse, int Hand, const ItemInst* weapon);
-
+	
 	//Song
 	bool UseBardSpellLogic(uint16 spell_id = 0xffff, int slot = -1);
 	bool ApplyNextBardPulse(uint16 spell_id, Mob *spell_target, uint16 slot);
@@ -945,6 +945,7 @@ protected:
 	int16 petpower;
 	uint32 follow;
 	uint32 follow_dist;
+	bool no_target_hotkey;
 
 	uint8 gender;
 	uint16 race;