Add ToggleOutline cvar and console command (#1185)

Co-authored-by: scuffedjays <yetanotherscuffed@gmail.com>

Content.Client/EntryPoint.cs

@@ -24,6 +24,7 @@ using Robust.Client.Interfaces.Input;
 using Robust.Client.Interfaces.State;
 using Robust.Client.Player;
 using Robust.Shared.ContentPack;
+using Robust.Shared.Interfaces.Configuration;
 using Robust.Shared.Interfaces.GameObjects;
 using Robust.Shared.Interfaces.Map;
 using Robust.Shared.IoC;
@@ -41,6 +42,7 @@ namespace Content.Client
         [Dependency] private readonly IEscapeMenuOwner _escapeMenuOwner;
         [Dependency] private readonly IGameController _gameController;
         [Dependency] private readonly IStateManager _stateManager;
+        [Dependency] private readonly IConfigurationManager _configurationManager;
 #pragma warning restore 649
 
         public override void Init()
@@ -223,6 +225,8 @@ namespace Content.Client
             {
                 IoCManager.Resolve<IMapManager>().CreateNewMapEntity(MapId.Nullspace);
             };
+
+             _configurationManager.RegisterCVar("outline.enabled", true);
         }
 
         /// <summary>