[ticket/11381] Make finder able to search in all available extensions

PHPBB3-11381
[ticket/11363] Fix to make get_module_infos get from all extensions

Depends on 11381

PHPBB3-11363
Merge remote-tracking branch 'EXreaction/ticket/11381' into develop

# By Nathaniel Guse
# Via Nathaniel Guse
* EXreaction/ticket/11381:
  [ticket/11381] Make finder able to search in all available extensions
Merge remote-tracking branch 'EXreaction/ticket/11363-2' into develop

# By Nathaniel Guse
# Via Nathaniel Guse
* EXreaction/ticket/11363-2:
  [ticket/11363] Fix to make get_module_infos get from all extensions
Merge branch 'develop' of git://github.com/phpbb/phpbb3 into ticket/11386

Conflicts:
	phpBB/includes/extension/finder.php