Create a `hide-if-matches-xpath` snippet.
Background
As discussed both a while ago and recently with filters developers too, we'd like to be able to experiment with XPath and see if it helps writing filters and hiding nodes easier than with CSS selectors.
What to change
Create a hide-if-matches-xpath
snippet that accepts an XPath query and hides all elements that would match such query.
Testing Notes
Visit http://example.com/ after writing the filter example.com#$#hide-if-matches-xpath /html/body/div/p[2]/a
and verify that the More information... link is hidden.