add basic print styles to CologneBlue

* Call parent method in setupSkinUserCss() to add standard print
  styles. It also adds mediawiki.legacy.shared, so we can remove
  explicit include of that one.
* Split #footer into #footer-navigation and #footer-info. These parts
  of footer have very different functions and the navigation should be
  hidden in print mode.
* Added skins/cologneblue/print.css hiding some non-standard
  navigation elements.

Bug: 42844
Change-Id: Iae67a06ff3a6efdc9a5084226c1c80634b806cfb
Merge "add basic print styles to CologneBlue"