Massive Namespace Cleanup (#1544)

* Removed the Interfaces folder.
* All objects inside the GameObjects subfolders are now in the GameObjects namespace.
* Added a Resharper DotSettings file to mark the GameObjects subfolders as not providing namespaces.
* Simplified Robust.client.Graphics namespace.
* Automated remove redundant using statements.

Robust.Shared/Utility/DebugTools.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Diagnostics;
-using System.Diagnostics.Contracts;
 using JetBrains.Annotations;
 
 namespace Robust.Shared.Utility