Mortician's Menagerie (#2391)

* Body bags!

* Morgue Trays and the Crematorium!
Reorganised body bags to be under Morgue, not Medical

* Fix. Things outside of EntityStorageComponents now use the Try*Storage() not just *Storage() methods - Allows mobs to be trapped in a morgue/crematorium whose tray can't open.

* Fix tests. Modernise component dependency and nullability.

* Update Content.Server/GameObjects/Components/Morgue/MorgueTrayComponent.cs

Co-authored-by: Víctor Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>

Content.Server/GameObjects/EntitySystems/MorgueSystem.cs

@@ -0,0 +1,27 @@
+using Content.Server.GameObjects.Components.Morgue;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public class MorgueSystem : EntitySystem
+    {
+
+        private float _accumulatedFrameTime;
+
+        public override void Update(float frameTime)
+        {
+            _accumulatedFrameTime += frameTime;
+
+            if (_accumulatedFrameTime >= 10)
+            {
+                foreach (var morgue in ComponentManager.EntityQuery<MorgueEntityStorageComponent>())
+                {
+                    morgue.Update();
+                }
+                _accumulatedFrameTime -= 10;
+            }
+        }
+    }
+}