GravityGeneratorWindow to XAML UI (#4638)

* Move color handling to localization strings, small improvements

* Create/move files to UI namespace

* Actually change namespace

* Move to XAML

* Improve localization

Content.Client/Gravity/UI/GravityGeneratorWindow.xaml.cs

@@ -0,0 +1,41 @@
+using Content.Client.Message;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+
+namespace Content.Client.Gravity.UI
+{
+    [GenerateTypedNameReferences]
+    public partial class GravityGeneratorWindow : SS14Window
+    {
+        private readonly GravityGeneratorBoundUserInterface _owner;
+
+        public Button Switch => SwitchProtected;
+
+        public GravityGeneratorWindow(GravityGeneratorBoundUserInterface ui)
+        {
+            RobustXamlLoader.Load(this);
+            IoCManager.InjectDependencies(this);
+
+            _owner = ui;
+
+            UpdateButton();
+        }
+
+        public void UpdateButton()
+        {
+            string status = Loc.GetString(_owner.IsOn
+                                              ? "gravity-generator-window-is-on"
+                                              : "gravity-generator-window-is-off");
+
+            Status.SetMarkup(Loc.GetString("gravity-generator-window-status-label", ("status", status)));
+
+            Switch.Text = Loc.GetString(_owner.IsOn
+                                            ? "gravity-generator-window-turn-off-button"
+                                            : "gravity-generator-window-turn-on-button");
+        }
+    }
+}