[ticket/12788] Update symfony components

PHPBB3-12788
[ticket/12788] Force 2.3.* on symfony dependencies

PHPBB3-12788
[ticket/12808] Fix small gap between username and drop-down arrow

PHPBB3-12808
[ticket/12811] Fix padding/margin bug affecting bottom layout

PHPBB3-12811
[ticket/12811] Responsive adjustments to margin changes

PHPBB3-12811
[ticket/12813] Fix page-jump title lang and use input type=number

PHPBB3-12813
[ticket/12813] Reorder .row pagination so it aligns better

PHPBB3-12813
[ticket/12816] Fix comment about logs in user_ban function

PHPBB3-12816
[ticket/12807] Changes PRUNE_FREQ to PRUNE_SHADOW_FREQ/_DAYS

PHPBB3-12807
[ticket/12807] Adds missing language variables language/en/acp/forums.php

PHPBB3-12807
[ticket/12807] New variables for _EXPLAIN

PHPBB3-12807
[ticket/12813] Use -moz-only fix instead of generic padding

PHPBB3-12813
[ticket/12813] Move inline-CSS to css file

PHPBB3-12813
[ticket/12815] Show memberlist link for guests (if permitted)

PHPBB3-12815
[ticket/12815] Remove S_REGISTERED_USER for team link

PHPBB3-12815
Merge remote-tracking branch 'PayBas/ticket/12815' into develop-ascraeus

* PayBas/ticket/12815:
  [ticket/12815] Remove S_REGISTERED_USER for team link
  [ticket/12815] Show memberlist link for guests (if permitted)
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12815] Remove S_REGISTERED_USER for team link
  [ticket/12815] Show memberlist link for guests (if permitted)
Merge remote-tracking branch 'PayBas/ticket/12808' into develop-ascraeus

* PayBas/ticket/12808:
  [ticket/12808] Fix small gap between username and drop-down arrow
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12808] Fix small gap between username and drop-down arrow
[ticket/12823] Remove all trailing whitespace

PHPBB3-12823