Multi World NPCs + patch on Player interactions

Made NPCs now work properly on multiworld system. Solved multiple issues
regarding Player Shops not giving back items properly when owner exits.
Added restriction on changing channels at FM rooms, preventing shop
owner entering Cash Shop.

scripts/npc/2131000.js

@@ -0,0 +1,10 @@
+/* Author: aaroncsn(MapleSea Like)(Incomplete)
+	NPC Name: 		Athena Pierce
+	Map(s): 		Altair Camp: Conference Hall(300000010)
+	Description: 		Unknown
+*/
+
+function start(){
+	cm.sendOk("It is been a while since we left Ossyria to avoid the Black Magician. If not for the world tree, I do not know where we would have been. I have been trying to establish myself here, but that is not easy. I wonder how things are like back home.");
+	cm.dispose();
+	}