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.Server/GameObjects/Components/Observer/GhostRolesEui.cs

@@ -0,0 +1,39 @@
+using Content.Server.Eui;
+using Content.Server.GameObjects.EntitySystems;
+using Content.Shared.Eui;
+using Content.Shared.GameObjects.Components.Observer;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Server.GameObjects.Components.Observer
+{
+    public class GhostRolesEui : BaseEui
+    {
+        public override GhostRolesEuiState GetNewState()
+        {
+            return new(EntitySystem.Get<GhostRoleSystem>().GetGhostRolesInfo());
+        }
+
+        public override void HandleMessage(EuiMessageBase msg)
+        {
+            base.HandleMessage(msg);
+
+            switch (msg)
+            {
+                case GhostRoleTakeoverRequestMessage req:
+                    EntitySystem.Get<GhostRoleSystem>().Takeover(Player, req.Identifier);
+                    break;
+
+                case GhostRoleWindowCloseMessage _:
+                    Closed();
+                    break;
+            }
+        }
+
+        public override void Closed()
+        {
+            base.Closed();
+
+            EntitySystem.Get<GhostRoleSystem>().CloseEui(Player);
+        }
+    }
+}