Make Assets.load* use a background thread on native

templates/haxe/DefaultAssetLibrary.hx

@@ -8,6 +8,7 @@ import lime.audio.AudioSource;
 import lime.audio.openal.AL;
 import lime.audio.AudioBuffer;
 import lime.graphics.Image;
+import lime.system.WorkerThread;
 import lime.text.Font;
 import lime.utils.ByteArray;
 import lime.utils.UInt8Array;
@@ -472,6 +473,7 @@ class DefaultAssetLibrary extends AssetLibrary {
 	public override function loadAudioBuffer (id:String, handler:AudioBuffer -> Void):Void {
 		
 		#if (flash)
+		
 		if (path.exists (id)) {
 			
 			var soundLoader = new Sound ();
@@ -482,13 +484,17 @@ class DefaultAssetLibrary extends AssetLibrary {
 				handler (audioBuffer);
 				
 			});
+			
 			soundLoader.load (new URLRequest (path.get (id)));
 			
 		} else {
+			
 			handler (getAudioBuffer (id));
 			
 		}
+		
 		#else
+		
 		handler (getAudioBuffer (id));
 		
 		#end
@@ -531,6 +537,7 @@ class DefaultAssetLibrary extends AssetLibrary {
 				handler (loader.data);
 				
 			});
+			
 			loader.load (new URLRequest (path.get (id)));
 			
 		} else {
@@ -541,7 +548,15 @@ class DefaultAssetLibrary extends AssetLibrary {
 		
 		#else
 		
-		handler (getBytes (id));
+		var worker = new WorkerThread ();
+		worker.doWork = function () {
+			
+			var bytes = getBytes (id);
+			worker.sendUpdate (bytes);
+			
+		}
+		worker.onUpdate.add (function (msg) handler (msg));
+		worker.run ();
 		
 		#end
 		
@@ -589,7 +604,15 @@ class DefaultAssetLibrary extends AssetLibrary {
 		
 		#else
 		
-		handler (getImage (id));
+		var worker = new WorkerThread ();
+		worker.doWork = function () {
+			
+			var image = getImage (id);
+			worker.sendUpdate (image);
+			
+		}
+		worker.onUpdate.add (function (msg) handler (msg));
+		worker.run ();
 		
 		#end
 		
@@ -703,6 +726,7 @@ class DefaultAssetLibrary extends AssetLibrary {
 				handler (loader.data);
 				
 			});
+			
 			loader.load (new URLRequest (path.get (id)));
 			
 		} else {