Add GPL modules

MediaBrowser.Controller/Entities/IHasMediaSources.cs

@@ -0,0 +1,19 @@
+using MediaBrowser.Model.Dto;
+using System.Collections.Generic;
+using MediaBrowser.Model.Entities;
+using System;
+
+namespace MediaBrowser.Controller.Entities
+{
+    public interface IHasMediaSources
+    {
+        /// <summary>
+        /// Gets the media sources.
+        /// </summary>
+        List<MediaSourceInfo> GetMediaSources(bool enablePathSubstitution);
+        List<MediaStream> GetMediaStreams();
+        Guid Id { get; set; }
+        long? RunTimeTicks { get; set; }
+        string Path { get; }
+    }
+}