Ghost sprites and a bunch of fixes

Content.Shared/GameObjects/Components/Observer/SharedGhostComponent.cs

@@ -0,0 +1,31 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.GameObjects.Components.Observer
+{
+    public class SharedGhostComponent : Component
+    {
+        public override string Name => "Ghost";
+        public override uint? NetID => ContentNetIDs.GHOST;
+
+        public virtual bool CanReturnToBody { get; set; } = true;
+    }
+
+    [Serializable, NetSerializable]
+    public class GhostComponentState : ComponentState
+    {
+        public bool CanReturnToBody { get; }
+
+        public GhostComponentState(bool canReturnToBody) : base(ContentNetIDs.GHOST)
+        {
+            CanReturnToBody = canReturnToBody;
+        }
+    }
+
+    [Serializable, NetSerializable]
+    public class ReturnToBodyComponentMessage : ComponentMessage
+    {
+        public ReturnToBodyComponentMessage() => Directed = true;
+    }
+}