Add GPL modules

MediaBrowser.Controller/Library/IMetadataFileSaver.cs

@@ -0,0 +1,19 @@
+using MediaBrowser.Controller.Entities;
+
+namespace MediaBrowser.Controller.Library
+{
+    public interface IMetadataFileSaver : IMetadataSaver
+    {
+        /// <summary>
+        /// Gets the save path.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <returns>System.String.</returns>
+        string GetSavePath(BaseItem item);
+    }
+
+    public interface IConfigurableProvider
+    {
+        bool IsEnabled { get; }
+    }
+}