Enable TreatWarningsAsErrors for MediaBrowser.Common and Emby.Photos

Adds `#pragma warning disable CS1591` to all files in
MediaBrowser.Common containing undocumented members.

MediaBrowser.Common/Configuration/IApplicationPaths.cs

@@ -77,7 +77,10 @@ namespace MediaBrowser.Common.Configuration
         /// <value>The temp directory.</value>
         string TempDirectory { get; }
 
+        /// <summary>
+        /// Gets the magic string used for virtual path manipulation.
+        /// </summary>
+        /// <value>The magic string used for virtual path manipulation.</value>
         string VirtualDataPath { get; }
     }
-
 }