Implement new always_aggro_foes field and functionality for mobs.

zone/mob.cpp

@@ -93,7 +93,8 @@ Mob::Mob(
 	uint8 in_handtexture,
 	uint8 in_legtexture,
 	uint8 in_feettexture,
-	uint16 in_usemodel
+	uint16 in_usemodel,
+	bool in_always_aggros_foes
 ) :
 	attack_timer(2000),
 	attack_dw_timer(2000),
@@ -275,6 +276,7 @@ Mob::Mob(
 	qglobal           = 0;
 	spawned           = false;
 	rare_spawn        = false;
+	always_aggros_foes = in_always_aggros_foes;
 
 	InitializeBuffSlots();