Merge branch 'develop' of https://github.com/phpbb/phpbb3 into feature/softdelete-1-permission-rebase

* 'develop' of https://github.com/phpbb/phpbb3: (544 commits)
  [feature/events] Fix improperly named event in documentation
  [feature/events] Fix alphabetization of events
  [feature/events] Put events in alphabetical order
  [feature/events] Make EVENTS.md lowercase
  [ticket/11285] Use more granularity in dependency checks in compress test
  [ticket/10880] The m_approve permisson no longer implies f_noapprove.
  [ticket/10803] Show failure message until user dismisses it
  [ticket/10954] Add missing semi-colon
  [ticket/10954] Make sure to mark subforums unread and add small fixes
  [feature/events] Use ` to escape HTML tags in markdown
  [feature/events] Remove HTML tags from markdown so they don't get parsed
  [ticket/10954] Miscellaneous coding fixes
  [feature/events] Remove extraneous space
  [feature/events] Add markdown template event documentation file
  [feature/events] forumlist_body_last_post_title_after -> _prepend (subsilver2)
  [feature/events] Fix overall_footer_end -> overall_footer_after (subsilver2)
  [feature/events] Fix typo in event name
  [ticket/10763] Use self when calling get_extension() in filespec class
  [feature/events] Fix more subsilver2 events
  [feature/events] Fix some subsilver2 events
  ...

Conflicts:
	phpBB/install/database_update.php
	phpBB/posting.php

phpBB/includes/functions_admin.php

@@ -3342,7 +3342,7 @@ function obtain_latest_version_info($force_update = false, $warn_fail = false, $
  * @param int		$flag			The binary flag which is OR-ed with the current column value
  * @param string	$sql_more		This string is attached to the sql query generated to update the table.
  *
- * @return void
+ * @return null
  */
 function enable_bitfield_column_flag($table_name, $column_name, $flag, $sql_more = '')
 {