Support escaped quotes in filters

Adds support for escaped quotes in filters link incategory and intitle.  This is important
because Hebrew uses double quotes in words so Hebrew Wikipedia uses them in
the names of categories that you might want to use with incategory or intitle or linksto or whatever.

Bug: 71123
Change-Id: Id0cffb88a99f473ccb36afbe379b18150206abe7
Merge "Support escaped quotes in filters"