Massive Namespace Cleanup (#3120)

* Engine namespace changes.

* Automated remove redundant using statements.

* Simplified Graphics namespace.

* Apparently the container system stores full type names in the map file.😞 This updates those names.

* API Changes to LocalizationManager.LoadCulture.

* Update submodule to v0.3.2

Content.IntegrationTests/Tests/VendingMachineTest.cs

@@ -1,7 +1,6 @@
 using System.Threading.Tasks;
 using Content.Shared.VendingMachines;
 using NUnit.Framework;
-using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Prototypes;
 
@@ -38,4 +37,4 @@ namespace Content.IntegrationTests.Tests
             await server.WaitIdleAsync();
         }
     }
-}
+}