Voting (#3185)

* Basic voting

* Rewrite lobby in XAML.
Working lobby voting.

* Escape menu is now XAML.

* Vote menu works, custom votes, gamemode votes.

* Vote timeouts & administration.

Basically done now.

* I will now pretend I was never planning to code voting hotkeys.

* Make vote call UI a bit... funny.

* Fix exception on round restart.

* Fix some vote command definitions.

Content.Client/UserInterface/TopNotification.cs

@@ -0,0 +1,9 @@
+using Robust.Client.UserInterface;
+
+namespace Content.Client.UserInterface
+{
+    public class TopNotification : Control
+    {
+
+    }
+}