Ghost Roles (#3106)

* Add files for Ghost Roles.

* Work on Ghost Roles

* Improvements

* GHOST ROLES IS DONE

* mmm yes

* auto-update when setting rolename/roledescription

* well

* command graceful error

* Makes UI have a scrollbar when it has too many entries

* fix command fuckup

* Apply suggestions from code review

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Client/GameObjects/Components/Observer/GhostRolesWindow.xaml.cs

@@ -0,0 +1,28 @@
+using System;
+using Content.Shared.GameObjects.Components.Observer;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Shared.Maths;
+
+namespace Content.Client.GameObjects.Components.Observer
+{
+    [GenerateTypedNameReferences]
+    public partial class GhostRolesWindow : SS14Window
+    {
+        public event Action<uint> RoleRequested;
+
+        protected override Vector2 CalculateMinimumSize() => (350, 275);
+
+        public void ClearEntries()
+        {
+            EntryContainer.DisposeAllChildren();
+            NoRolesMessage.Visible = true;
+        }
+
+        public void AddEntry(GhostRoleInfo info)
+        {
+            NoRolesMessage.Visible = false;
+            EntryContainer.AddChild(new GhostRolesEntry(info, _ => RoleRequested?.Invoke(info.Identifier)));
+        }
+    }
+}