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/Voting/VoteCallMenuButton.cs

@@ -0,0 +1,49 @@
+using Robust.Client.UserInterface.Controls;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+
+namespace Content.Client.Voting
+{
+    /// <summary>
+    ///     LITERALLY just a button that opens the vote call menu.
+    ///     Automatically disables itself if the client cannot call votes.
+    /// </summary>
+    public sealed class VoteCallMenuButton : Button
+    {
+        [Dependency] private readonly IVoteManager _voteManager = default!;
+
+        public VoteCallMenuButton()
+        {
+            IoCManager.InjectDependencies(this);
+
+            Text = Loc.GetString("Call vote");
+            OnPressed += OnOnPressed;
+        }
+
+        private void OnOnPressed(ButtonEventArgs obj)
+        {
+            var menu = new VoteCallMenu();
+            menu.OpenCentered();
+        }
+
+        protected override void EnteredTree()
+        {
+            base.EnteredTree();
+
+            UpdateCanCall(_voteManager.CanCallVote);
+            _voteManager.CanCallVoteChanged += UpdateCanCall;
+        }
+
+        protected override void ExitedTree()
+        {
+            base.ExitedTree();
+
+            _voteManager.CanCallVoteChanged += UpdateCanCall;
+        }
+
+        private void UpdateCanCall(bool canCall)
+        {
+            Disabled = !canCall;
+        }
+    }
+}