[GM Commands] Split GM Commands Into Separate Files (#1766)

* Split GM commands into their own files

* Code cleanup

zone/gm_commands/aggrozone.cpp

@@ -0,0 +1,19 @@
+#include "../client.h"
+
+void command_aggrozone(Client *c, const Seperator *sep)
+{
+	if (!c) {
+		return;
+	}
+
+	Mob *m = c->CastToMob();
+
+	if (!m) {
+		return;
+	}
+
+	uint32 hate = atoi(sep->arg[1]); //should default to 0 if we don't enter anything
+	entity_list.AggroZone(m, hate);
+	c->Message(Chat::White, "Train to you! Last chance to go invulnerable...");
+}
+