CologneBlue rewrite: finally a proper sidebar using standard functions

CologneBlue rewrite: finally a proper sidebar using standard functions

We use standard functions, then mangle the results slightly to get
something that greatly resembles the old quickbar.

The changes caused several items to be reworded, which is good for
consistency.

This causes disappearance of two links:
* "Editing help" link in "Edit" menu - good riddance
* "Printable version" link in "This page" menu - we can do without it,
  it's present in toolbox

This causes appearance of two new links:
* "+" (new section) in "Edit" menu
* "Page" or "Discussion" in "This page" menu; previously only one of them
  would be shown

Change-Id: I13b76a4dab27eba3eaf8cccf72199cad5f8e26db