Update to 3.5.2 and .net core 2.1

MediaBrowser.Controller/Entities/ICollectionFolder.cs

@@ -1,23 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace MediaBrowser.Controller.Entities
-{
-    /// <summary>
-    /// This is just a marker interface to denote top level folders
-    /// </summary>
-    public interface ICollectionFolder
-    {
-        string CollectionType { get; }
-        string Path { get; }
-        string Name { get; }
-        Guid Id { get; }
-        string[] PhysicalLocations { get; }
-    }
-
-    public interface ISupportsUserSpecificView
-    {
-        bool EnableUserSpecificView { get; }
-    }
-}