Remove some unused drawing code

MediaBrowser.Controller/Drawing/ImageStream.cs

@@ -1,42 +0,0 @@
-#pragma warning disable CA1711, CS1591
-
-using System;
-using System.IO;
-using MediaBrowser.Model.Drawing;
-
-namespace MediaBrowser.Controller.Drawing
-{
-    public class ImageStream : IDisposable
-    {
-        public ImageStream(Stream stream)
-        {
-            Stream = stream;
-        }
-
-        /// <summary>
-        /// Gets the stream.
-        /// </summary>
-        /// <value>The stream.</value>
-        public Stream Stream { get; }
-
-        /// <summary>
-        /// Gets or sets the format.
-        /// </summary>
-        /// <value>The format.</value>
-        public ImageFormat Format { get; set; }
-
-        public void Dispose()
-        {
-            Dispose(true);
-            GC.SuppressFinalize(this);
-        }
-
-        protected virtual void Dispose(bool disposing)
-        {
-            if (disposing)
-            {
-                Stream?.Dispose();
-            }
-        }
-    }
-}