Support Fabric for 1.14.1 (#53)

* Fix ClassCastException

* Support Fabric for 1.14.1

* Support Fabric for 1.14.1

* Use mapping file instead of hard code

Common/source/customskinloader/utils/JavaUtil.java

@@ -28,7 +28,7 @@ public class JavaUtil {
                 } catch (Exception ignored) {
                 }
             }
-            return (URL[]) urls.toArray();
+            return urls.toArray(new URL[0]);
         }
     }
 }