Add ArrayUtil

Adds a utility primarily for haxe versions that did not support array resizing

src/starling/animation/Juggler.hx

@@ -16,6 +16,7 @@ import openfl.errors.ArgumentError;
 
 import starling.events.Event;
 import starling.events.EventDispatcher;
+import starling.utils.ArrayUtil;
 
 /** The Juggler takes objects that implement IAnimatable (like Tweens) and executes them.
  * 
@@ -403,8 +404,11 @@ class Juggler implements IAnimatable
 
             while (i < numObjects)
                 __objects[currentIndex++] = __objects[i++];
-
+            #if (haxe_ver >= 4.0)
             __objects.resize(currentIndex);
+            #else
+            ArrayUtil.resize(__objects, currentIndex);
+            #end
         }
     }
 

src/starling/utils/ArrayUtil.hx

@@ -0,0 +1,44 @@
+package starling.utils;
+
+/**
+ * Array Utility.
+ */
+class ArrayUtil
+{
+    /**
+     * Truncates an array to the specified length.
+     * @param arr The array to truncate.
+     * @param newSize The new size of the array.
+     */
+     public static function truncate<T>(arr:Array<T>, newSize:Int):Void {
+        if (newSize < arr.length) {
+            arr.splice(newSize, arr.length - newSize);
+        }
+    }
+
+    /**
+     * Extends an array to the specified length, filling new elements with the default value.
+     * @param arr The array to extend.
+     * @param newSize The new size of the array.
+     * @param defaultValue The value to fill new elements with.
+     */
+    public static function extend<T>(arr:Array<T>, newSize:Int, defaultValue:T):Void {
+        while (arr.length < newSize) {
+            arr.push(defaultValue);
+        }
+    }
+
+    /**
+     * Resizes an array to the specified length, truncating or extending as needed.
+     * @param arr The array to resize.
+     * @param newSize The new size of the array.
+     * @param defaultValue The value to fill new elements with when extending.
+     */
+    public static function resize<T>(arr:Array<T>, newSize:Int, defaultValue:T):Void {
+        if (newSize < arr.length) {
+            truncate(arr, newSize);
+        } else {
+            extend(arr, newSize, defaultValue);
+        }
+    }
+}