Resizable node live preview

Resizes the $resizable element as you drag.
Can be disabled by setting the 'outline' config option.

FocusableNode
* Redraw on resize

ProtectedNode
* Destroy and prevent creation of phantoms on resize

MWInlineImageNode
* Correctly pass this.$image to ResizableNode

Bug: 54298
Change-Id: I7d6d345af8bb4712bbf154072b4704943a5a620d
Merge "Resizable node live preview"