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/GhostTargetWindow.xaml.cs

@@ -0,0 +1,85 @@
+using System.Collections.Generic;
+using Content.Shared.Ghost;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Localization;
+
+namespace Content.Client.Ghost.UI
+{
+    [GenerateTypedNameReferences]
+    public partial class GhostTargetWindow : SS14Window
+    {
+        private readonly IEntityNetworkManager _netManager;
+
+        public List<string> Locations { get; set; } = new();
+
+        public Dictionary<EntityUid, string> Players { get; set; } = new();
+
+        public GhostTargetWindow(IEntityNetworkManager netManager)
+        {
+            RobustXamlLoader.Load(this);
+
+            _netManager = netManager;
+        }
+
+        public void Populate()
+        {
+            ButtonContainer.DisposeAllChildren();
+            AddButtonPlayers();
+            AddButtonLocations();
+        }
+
+        private void AddButtonPlayers()
+        {
+            foreach (var (key, value) in Players)
+            {
+                var currentButtonRef = new Button
+                {
+                    Text = value,
+                    TextAlign = Label.AlignMode.Right,
+                    HorizontalAlignment = HAlignment.Center,
+                    VerticalAlignment = VAlignment.Center,
+                    SizeFlagsStretchRatio = 1,
+                    MinSize = (230, 20),
+                    ClipText = true,
+                };
+
+                currentButtonRef.OnPressed += (_) =>
+                {
+                    var msg = new GhostWarpToTargetRequestEvent(key);
+                    _netManager.SendSystemNetworkMessage(msg);
+                };
+
+                ButtonContainer.AddChild(currentButtonRef);
+            }
+        }
+
+        private void AddButtonLocations()
+        {
+            foreach (var name in Locations)
+            {
+                var currentButtonRef = new Button
+                {
+                    Text = Loc.GetString("ghost-target-window-current-button", ("name", name)),
+                    TextAlign = Label.AlignMode.Right,
+                    HorizontalAlignment = HAlignment.Center,
+                    VerticalAlignment = VAlignment.Center,
+                    SizeFlagsStretchRatio = 1,
+                    MinSize = (230, 20),
+                    ClipText = true,
+                };
+
+                currentButtonRef.OnPressed += _ =>
+                {
+                    var msg = new GhostWarpToLocationRequestEvent(name);
+                    _netManager.SendSystemNetworkMessage(msg);
+                };
+
+                ButtonContainer.AddChild(currentButtonRef);
+            }
+        }
+    }
+}