Ghost UI to XAML and minor cleanup (#4637)

* Remove unused class, clean up XAML

* Move GhostGui.cs into UI folder and namespace

* GhostTargetWindow to seperate file

* GhostTargetWindow to XAML

* Center request button

* Improve UI, localisation

Content.Client/Ghost/UI/GhostGui.cs

@@ -0,0 +1,73 @@
+using Content.Shared.Ghost;
+using Robust.Client.Console;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+using static Robust.Client.UserInterface.Controls.BoxContainer;
+
+namespace Content.Client.Ghost.UI
+{
+    public class GhostGui : Control
+    {
+        private readonly Button _returnToBody = new() {Text = Loc.GetString("ghost-gui-return-to-body-button") };
+        private readonly Button _ghostWarp = new() {Text = Loc.GetString("ghost-gui-ghost-warp-button") };
+        private readonly Button _ghostRoles = new() {Text = Loc.GetString("ghost-gui-ghost-roles-button") };
+        private readonly GhostComponent _owner;
+
+        public GhostTargetWindow? TargetWindow { get; }
+
+        public GhostGui(GhostComponent owner, IEntityNetworkManager eventBus)
+        {
+            IoCManager.InjectDependencies(this);
+
+            _owner = owner;
+
+            TargetWindow = new GhostTargetWindow(eventBus);
+
+            MouseFilter = MouseFilterMode.Ignore;
+
+            _ghostWarp.OnPressed += _ =>
+            {
+                eventBus.SendSystemNetworkMessage(new GhostWarpsRequestEvent());
+                TargetWindow.Populate();
+                TargetWindow.OpenCentered();
+            };
+            _returnToBody.OnPressed += _ =>
+            {
+                var msg = new GhostReturnToBodyRequest();
+                eventBus.SendSystemNetworkMessage(msg);
+            };
+            _ghostRoles.OnPressed += _ => IoCManager.Resolve<IClientConsoleHost>()
+                .RemoteExecuteCommand(null, "ghostroles");
+
+            AddChild(new BoxContainer
+            {
+                Orientation = LayoutOrientation.Horizontal,
+                Children =
+                {
+                    _returnToBody,
+                    _ghostWarp,
+                    _ghostRoles,
+                }
+            });
+        }
+
+        public void Update()
+        {
+            _returnToBody.Disabled = !_owner.CanReturnToBody;
+            TargetWindow?.Populate();
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            if (disposing)
+            {
+                TargetWindow?.Dispose();
+            }
+        }
+    }
+}