Objectives:
* Rename this.$ to this.$element
* Rename this.$$ to this.$
* Get rid of the need to use this.frame.$$
* Rename OO.ui.Element.get$$ to OO.ui.Element.getJQuery
Changes: (using Sublime Text regex patterns)
* Replace "get$$" with "getJQuery"
* Replace "\.(\$)([^\$a-zA-Z])" with ".$element$2"
* Replace "\.(\$\$)" with ".$"
* Replace "'$$'" with "'$'"
* Set this.$ to null in constructor of OO.ui.Window
* Set this.$ to this.frame.$ in initialize method of OO.ui.Window
* Replace "\.(frame.\$)([^\$a-zA-Z])" with ".\$$2"
Bonus:
* Use this.$() in a bunch of places where $() was erroneously used
Change-Id: If3d870124ab8d10f8223532cda95c2b2b075db94
Since I0f0a826c in Parsoid, numbered external links are now empty
<a rel="mw:ExtLink"></a> tags. This means we have to put in a node type
for them to prevent them from being considered empty annotations and
getting converted to alienMeta.
MWNumberedExternalLinkNode is protected and focusable to avoid making
the link text (which isn't editable) clickable. It isn't inspectable
yet, we need to work on that.
Bug: 53505
Change-Id: I83f69695f3974089e51a84e799f31ab6ed879e05