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/2141000.js

@@ -0,0 +1,19 @@
+/*
+ * Time Temple - Kirston
+ * Twilight of the Gods
+ */
+
+function start() {
+    cm.askAcceptDecline("If only I had the Mirror of Goodness then I can re-summon the Black Wizard! \r\nWait! something's not right! Why is the Black Wizard not summoned? Wait, what's this force? I feel something... totally different from the Black Wizard Ahhhhh!!!!! \r\n\r\n #b(Places a hand on the shoulder of Kryston.)");
+}
+
+function action(mode, type, selection) {
+    if (mode == 1) {
+	cm.removeNpc(270050100, 2141000);
+	cm.forceStartReactor(270050100, 2709000);
+    }
+    cm.dispose();
+
+// If accepted, = summon PB + Kriston Disappear + 1 hour timer
+// If deny = NoTHING HAPPEN
+}