Add commands to show and hide organs inside bodies (#2292)

* Add seeing entities through containers and on the context menu and 4 commands

* Remove unused imports

Content.Server/GameObjects/EntitySystems/VerbSystem.cs

@@ -1,7 +1,12 @@
-using System.Collections.Generic;
+#nullable enable
+using System.Collections.Generic;
 using System.Reflection;
+using Content.Shared.GameObjects.EntitySystemMessages;
 using Content.Shared.GameObjects.Verbs;
+using Content.Shared.GameTicking;
 using Robust.Server.Interfaces.Player;
+using Robust.Server.Player;
+using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Interfaces.GameObjects;
 using Robust.Shared.IoC;
@@ -10,18 +15,63 @@ using static Content.Shared.GameObjects.EntitySystemMessages.VerbSystemMessages;
 
 namespace Content.Server.GameObjects.EntitySystems
 {
-    public class VerbSystem : SharedVerbSystem
+    public class VerbSystem : SharedVerbSystem, IResettingEntitySystem
     {
         [Dependency] private readonly IEntityManager _entityManager = default!;
+        [Dependency] private readonly IPlayerManager _playerManager = default!;
+
+        private readonly HashSet<IPlayerSession> _seesThroughContainers = new HashSet<IPlayerSession>();
 
         public override void Initialize()
         {
             base.Initialize();
 
+            IoCManager.InjectDependencies(this);
+
             SubscribeNetworkEvent<RequestVerbsMessage>(RequestVerbs);
             SubscribeNetworkEvent<UseVerbMessage>(UseVerb);
 
-            IoCManager.InjectDependencies(this);
+            _playerManager.PlayerStatusChanged += PlayerStatusChanged;
+        }
+
+        private void PlayerStatusChanged(object? sender, SessionStatusEventArgs args)
+        {
+            if (args.NewStatus == SessionStatus.Disconnected)
+            {
+                _seesThroughContainers.Remove(args.Session);
+            }
+        }
+
+        public void Reset()
+        {
+            _seesThroughContainers.Clear();
+        }
+
+        public void AddContainerVisibility(IPlayerSession session)
+        {
+            if (!_seesThroughContainers.Add(session))
+            {
+                return;
+            }
+
+            var message = new PlayerContainerVisibilityMessage(true);
+            RaiseNetworkEvent(message, session.ConnectedClient);
+        }
+
+        public void RemoveContainerVisibility(IPlayerSession session)
+        {
+            if (!_seesThroughContainers.Remove(session))
+            {
+                return;
+            }
+
+            var message = new PlayerContainerVisibilityMessage(false);
+            RaiseNetworkEvent(message, session.ConnectedClient);
+        }
+
+        public bool HasContainerVisibility(IPlayerSession session)
+        {
+            return _seesThroughContainers.Contains(session);
         }
 
         private void UseVerb(UseVerbMessage use, EntitySessionEventArgs eventArgs)