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/State/LauncherConnecting.cs

@@ -31,14 +31,6 @@ namespace Content.Client.State
 
         public override void Startup()
         {
-            var panelTex = ResC.GetTexture("/Textures/Interface/Nano/button.svg.96dpi.png");
-            var back = new StyleBoxTexture
-            {
-                Texture = panelTex,
-                Modulate = new Color(32, 32, 48),
-            };
-            back.SetPatchMargin(StyleBox.Margin.All, 10);
-
             Button exitButton;
             Button reconnectButton;
             Button retryButton;
@@ -50,10 +42,7 @@ namespace Content.Client.State
                 Stylesheet = _stylesheetManager.SheetSpace,
                 Children =
                 {
-                    new PanelContainer
-                    {
-                        PanelOverride = back
-                    },
+                    new PanelContainer {StyleClasses = {StyleBase.ClassAngleRect}},
                     new VBoxContainer
                     {
                         SeparationOverride = 0,