fixed inactivity timer

Scripts/Chunk.cs

@@ -157,7 +157,9 @@ public class Chunk {
         swapTo.Chunk.Elements[swapTo.Position.X, swapTo.Position.Y] = swapTo;
 
         what.Active = true;
+        what.Moved();
         swapTo.Active = true;
+        swapTo.Moved();
     }
 
     public override string ToString() {

Scripts/Elements/Element.cs

@@ -110,4 +110,8 @@ public class Element {
 
         this.color = color;
     }
+
+    public void Moved() {
+        lastMove = Engine.GetFramesDrawn();
+    }
 }