DevTools: [Elements] Implement shortcut-based node cut-copy-pasting

Source/devtools/front_end/inspectorStyle.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 1335 matching lines @@
     right: 0;
     height: 15px;
     z-index: -1;
 }
 
 .outline-disclosure li.selected .selection {
     display: block;
     background-color: rgb(212, 212, 212);
 }
 
+.outline-disclosure li.in-clipboard .highlight {
+    outline: 1px dotted darkgrey;
+}
+
 .outline-disclosure li.elements-drag-over .selection {
     display: block;
     margin-top: -2px;
     border-top: 2px solid rgb(56, 121, 217);
 }
 
 .outline-disclosure ol:focus li.selected .selection {
     background-color: rgb(56, 121, 217);
 }
 
@@ skipping 1558 matching lines @@
 }
 
 .viewport-control-gap-element {
     color: transparent;
 }
 
 label.checkbox-with-label {
     display: flex;
     -webkit-user-select: none;
 }