Fix spam objects IntArray in the method JamepadControllerMonitor#upda…

…te. (#25)

This method is called many times in second (each step in UI thread).

gdx-controllers-desktop/src/main/java/com/badlogic/gdx/controllers/desktop/support/JamepadControllerMonitor.java

@@ -12,6 +12,8 @@ public class JamepadControllerMonitor implements Runnable {
     private final ControllerManager controllerManager;
     private final ControllerListener listener;
     private final IntMap<Tuple> indexToController = new IntMap<>();
+    //temporary array for cleaning disconnected controllers
+    private final IntArray disconnectedControllers = new IntArray();
 
     public JamepadControllerMonitor(ControllerManager controllerManager, ControllerListener listener) {
         this.controllerManager = controllerManager;
@@ -46,7 +48,7 @@ private void checkForNewControllers() {
     }
 
     private void update() {
-        IntArray disconnectedControllers = new IntArray(indexToController.size);
+        disconnectedControllers.clear();
         for (Tuple tuple : indexToController.values()) {
             JamepadController controller = tuple.controller;
             boolean connected = controller.update();