Reimplementation of sort()

Reimplementation of sort()

Reimplementation of sort() using collator.
Fix of ft_backlinks() and ft_mediause() function in "fulltext.php".

Functions that call ft_backlinks() and now have the expected results:
html.php:1085, html_backlinks(): display backlinks
Remote\ApiCore.php:456, listBackLinks(): Return a list of backlinks

Functions that call ft_mediause() and now have the expected results:
media.php:222, media_inuse(): Convenience function to check if a media file is still in use
media.php:1199, media_details(): Prints mediafile tags

Screens fixed:
- Backlinks
- List of pages that references a media file (View tab in the 3rd column of Media Manager)