Refactor ResourceLoader, use only Texture2d in Renderer.

Source/Resources/Loaders/ResourceLoader.cs

@@ -0,0 +1,8 @@
+namespace DaggerFramework
+{
+    public abstract class ResourceLoader<T> : IDisposable where T : Resource
+    {
+        public void Dispose() { }
+        public abstract T Load(string path);
+    }
+}