Quick fix-up + Happyville

Fixed bug introduced on last update regarding events without
event_schedule defined. Added path to Happyville maps, and raid boss
event.

src/scripting/event/EventInstanceManager.java

@@ -318,7 +318,7 @@ public class EventInstanceManager {
                 wL.unlock();
             }
             
-            event_schedule.cancel(true);
+            if(event_schedule != null) event_schedule.cancel(true);
 
             mobs.clear();
             killCount.clear();