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/2131006.js

@@ -0,0 +1,36 @@
+var status = -1;
+var exchangeItem = 4000440;
+
+function start() {
+    action(1, 0, 0);
+}
+
+function action(mode, type, selection) {
+    if (mode == 1) {
+	status++;
+    } else {
+	cm.dispose();
+	return;
+    }
+    if (status == 0) {
+        cm.sendSimple("The monsters are advancing.. I can't fight. I was badly injured by the Primitive Boars...#b\r\n#L0#Hey, take these boar hides. You can recover from them.#l");
+    } else if (status == 1) {
+	if (!cm.haveItem(exchangeItem, 100)) {
+	    cm.sendNext("You don't have enough... I need at least 100.");
+	    cm.dispose();
+	} else {
+	    cm.sendGetNumber("Hey, that's a good idea! I can give you #i4310000#Perfect Pitch for each 100 #i" + exchangeItem + "##t" + exchangeItem + "# you give me. How many do you want? (Current Items: " + cm.getPlayer().itemQuantity(exchangeItem) + ")", java.lang.Math.min(300, cm.getPlayer().itemQuantity(exchangeItem) / 100), 1, java.lang.Math.min(300, cm.getPlayer().itemQuantity(exchangeItem) / 100));
+	}
+    } else if (status == 2) { 
+	if (selection >= 1 && selection <= cm.getPlayer().itemQuantity(exchangeItem) / 100) {
+	    if (!cm.canHold(4310000, selection)) {
+		cm.sendOk("Please make some space in ETC tab.");
+	    } else {
+		cm.gainItem(4310000, selection);
+		cm.gainItem(exchangeItem, -(selection * 100));
+		cm.sendOk("Thanks!");
+	    }
+	}
+        cm.dispose();
+    }
+}