[ticket/12778] Automatically delete files on update

PHPBB3-12778
[ticket/12778] Rename the file to *.bak instead of deleting

PHPBB3-12778
[ticket/12535] Make <a> adjust to the image width

PHPBB3-12535
[ticket/12535] Add events to subsilver2

Forgot subsilver... yet again

PHPBB3-12535
[ticket/12535] Update events.md to RC3

PHPBB3-12535
[ticket/12535] Combine inner clearing CSS rules

PHPBB3-12535
[ticket/12880] core.mcp_queue_!is_topics_query_before

Adding core.mcp_queue_is_topics_query_before

PHPBB3-12880
[ticket/12876] core.mcp_mcp_front.mcp_front_view_queue_postid_list_after

Adding the core.mcp_mcp_front.mcp_front_view_queue_topicid_list_after
event to mcp backend.

PHPBB3-12876
[ticket/12886] Remove obsolete check for f_user_lock

The user shouldn't be able to unlock his own topic if he doesn't have m_lock
permissions. Also, the check for f_user_lock was never going to evaluate to
true due to the topic not being unlocked making it obsolete anyway.

PHPBB3-12886
[ticket/12853] Hide moderator link if it is really necessary

PHPBB3-12853
Merge pull request #2829 from nickvergessen/ticket/12853

[ticket/12853] Hide moderator link if it is really necessary
[ticket/12927] core.mcp_queue_get_posts2_query_before

Adding the core.mcp_queue_get_posts2_query_before
event to mcp backend.

PHPBB3-12927
[ticket/10404] Use anonymous function instead of create_function in acp/auth

PHPBB3-10404
[ticket/12744] Fix additional height of one line in header in rtl languages

PHPBB3-12744
Merge remote-tracking branch 'marc1706/ticket/12744' into develop-ascraeus

* marc1706/ticket/12744:
  [ticket/12744] Fix additional height of one line in header in rtl languages
Merge remote-tracking branch 'PayBas/ticket/12535' into develop-ascraeus

* PayBas/ticket/12535:
  [ticket/12535] Combine inner clearing CSS rules
  [ticket/12535] Update events.md to RC3
  [ticket/12535] Add events to subsilver2
  [ticket/12535] Make <a> adjust to the image width
[ticket/10404] Fix codesniffer complaint about anonymous function

PHPBB3-10404
Merge pull request #2762 from brunoais/ticket/12876

[ticket/12876] core.mcp_mcp_front.mcp_front_view_queue_postid_list_after

* brunoais/ticket/12876:
  [ticket/12876] core.mcp_mcp_front.mcp_front_view_queue_postid_list_after
Merge pull request #2764 from brunoais/ticket/12880

[ticket/12880] core.mcp_queue_!is_topics_query_before

* brunoais/ticket/12880:
  [ticket/12880] core.mcp_queue_!is_topics_query_before
[ticket/12789] Remove the directories in \phpbb\cache\driver\memory::purge()

PHPBB3-12789