Drag changes (#2487)

* Drag changes

* Higlights only show near cursor
* Don't highlight un-droppable entities
* Fixes invalid highlights issue

* Also the scanner

* 2 months fix

* Address reviews

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Client/GameObjects/Components/Buckle/BuckleComponent.cs

@@ -6,6 +6,7 @@ using Robust.Shared.Interfaces.GameObjects;
 namespace Content.Client.GameObjects.Components.Buckle
 {
     [RegisterComponent]
+    [ComponentReference(typeof(SharedBuckleComponent))]
     public class BuckleComponent : SharedBuckleComponent
     {
         private bool _buckled;