Reimplementation of strcmp()

Reimplementation of strcmp()

Reimplementation of strcmp() using collator.
Fix of ft_pagesorter() function in "fulltext.php".
ft_pagesorter() is used by _ft_pageLookup(), which is used by ft_pageLookup().

Functions that call ft_pageLookup() and now have the expected results:
Action\Search.php:69, execute(): run the search
Ajax.php:50, callQsearch(): Searches for matching pagenames
Ajax.php:352, callLinkwiz(): List matching namespaces and pages for the link wizard

Screens fixed:
- Search (list of Matching pagenames)
- Quick search (when typing)
- Internal link suggestion when editing a page (when nothing was typed)