[ticket/12563] Changes 2 language variables to better understandable names

PHPBB3-12563
[ticket/12563] Removes strintf in acp_styles.php and shorts up <a>

PHPBB3-12563
[ticket/12563] Removes ending . from <a>

PHPBB3-12563
[ticket/12728] Enforce box model sizing on image attachment thumbnails

PHPBB3-12728
[ticket/12612] Move functions from posting.php to functions_posting.php

PHPBB3-12612
[ticket/12612] Move functions from memberlist.php to functions_display.php

PHPBB3-12612
[ticket/12612] Move function from ucp.php to functions_user.php

PHPBB3-12612
[ticket/12612] Move functions from mcp.php to functions_mcp.php

PHPBB3-12612
[ticket/12728] Adjust .postimage sizing to 100%

PHPBB3-12728
[ticket/12690] Add core.submit_pm_after event

Add core.submit_pm_after to funtion submit_pm.
Event will return just submited msg_id. It should be plased
just before return $data['msg_id'];

Justification:
Using only core.submit_pm_before does not allow to
follow up after message submission.
The message ID is recieved at DB submission.
Some times we need the MSG_ID as identifier

PHPBB3-12690
[ticket/12690] Add other info to core.submit_pm_after

Added $mode
Added $subject
Added $data
Added $pm_data

PHPBB3-12690
[ticket/12690] Remove $msg_id and chmod

Remove inneded $msg_id
Chmod file to 644

PHPBB3-12690
[ticket/12563] Adds &laquo; and &raquo; to the links in acp_styles.php

PHPBB3-12563
[ticket/12690] Find a space

Lost a spce there ... found it ...

PHPBB3-12690
Merge remote-tracking branch 'github-nickvergessen/ticket/12612-ascraeus' into develop-ascraeus

* github-nickvergessen/ticket/12612-ascraeus:
  [ticket/12612] Move functions from mcp.php to functions_mcp.php
  [ticket/12612] Move function from ucp.php to functions_user.php
  [ticket/12612] Move functions from memberlist.php to functions_display.php
  [ticket/12612] Move functions from posting.php to functions_posting.php
[ticket/11528] Handle case when config file cant be written by installer

PHPBB3-11528
[ticket/11528] Change click_submit() to accept id as param

PHPBB3-11528
Merge pull request #2571 from Crizz0/ticket/12563

[ticket/12563] Changes 2 style specific language variables for better understanding
Merge pull request #2609 from VSEphpbb/ticket/12728

[ticket/12728] Enforce box model sizing on image attachment thumbnails

* VSEphpbb/ticket/12728:
  [ticket/12728] Adjust .postimage sizing to 100%
  [ticket/12728] Enforce box model sizing on image attachment thumbnails
Merge pull request #2574 from lucifer4o/ticket/12690

[ticket/12690] Add core.submit_pm_after event

* lucifer4o/ticket/12690:
  [ticket/12690] Find a space
  [ticket/12690] Remove $msg_id and chmod
  [ticket/12690] Add other info to core.submit_pm_after
  [ticket/12690] Add core.submit_pm_after event