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/GhostRoleComponent.cs

@@ -0,0 +1,75 @@
+using Content.Server.GameObjects.EntitySystems;
+using Robust.Server.Interfaces.Player;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Systems;
+using Robust.Shared.Serialization;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.GameObjects.Components.Observer
+{
+    public abstract class GhostRoleComponent : Component
+    {
+        private string _roleName;
+        private string _roleDescription;
+
+        // We do this so updating RoleName and RoleDescription in VV updates the open EUIs.
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public string RoleName
+        {
+            get
+            {
+                return _roleName;
+            }
+            private set
+            {
+                _roleName = value;
+                EntitySystem.Get<GhostRoleSystem>().UpdateAllEui();
+            }
+        }
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public string RoleDescription
+        {
+            get
+            {
+                return _roleDescription;
+            }
+            private set
+            {
+                _roleDescription = value;
+                EntitySystem.Get<GhostRoleSystem>().UpdateAllEui();
+            }
+        }
+
+        [ViewVariables(VVAccess.ReadOnly)]
+        public bool Taken { get; protected set; }
+
+        [ViewVariables]
+        public uint Identifier { get; set; }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(ref _roleName, "name", "Unknown");
+            serializer.DataField(ref _roleDescription, "description", "Unknown");
+        }
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            EntitySystem.Get<GhostRoleSystem>().RegisterGhostRole(this);
+        }
+
+        protected override void Shutdown()
+        {
+            base.Shutdown();
+
+            EntitySystem.Get<GhostRoleSystem>().UnregisterGhostRole(this);
+        }
+
+        public abstract bool Take(IPlayerSession session);
+    }
+}