[ticket/11528] Move related code from functions_posting to function

Move related code from functions_posting to
remove_post_from_statistic() in content_visibility.php

PHPBB3-11528
[ticket/12738] Inject config object into content_visibility class

PHPBB3-12738
[ticket/12832] Make .small-icon styling uniform

PHPBB3-12832
[ticket/12832] Add footer links to quick-links

PHPBB3-12832
[ticket/12832] Remove unnecessary attr and classes

PHPBB3-12832
[ticket/12832] Remove old .quick-links icon reference

PHPBB3-12832
[ticket/12838] Add template events to acp_ranks.html

PHPBB3-12838
[ticket/12838] Add _before versions

PHPBB3-12838
[ticket/12838] Update events.md

PHPBB3-12838
[ticket/12838] Add core events to acp_ranks.php

PHPBB3-12838
[ticket/12838] Simplify special rank template conditional

PHPBB3-12838
[ticket/12838] Add raw row-data to acp_ranks core event

PHPBB3-12838
[ticket/12838] Allow for extra columns in cache obtain_ranks()

PHPBB3-12838
[ticket/12838] Update events.md to RC3

PHPBB3-12838
[ticket/12838] Update RC2 to RC3

PHPBB3-12838
[ticket/12873] Test the good identifier in \phpbb\db\tools

We need to rename the index key because with the default prefix (phpbb_)
this key has a length of 31. And because we don't accept the keys longer
than 30 characters we should ensure that by default no key is longer than
30 characters.

PHPBB3-12873
[ticket/12738] Update constructor docblock

PHPBB3-12738
[ticket/12919] Use the modules basename as identifier for extension modules

PHPBB3-12919
[ticket/12873] Don not touch the existing migrations

PHPBB3-12873
[ticket/12838] Simplify normal special rank array creation

PHPBB3-12838