Merge pull request #2557 from Elsensee/ticket/12516

[ticket/12516] Always preview signature in UCP/ACP module

* Elsensee/ticket/12516:
  [ticket/12516] Always preview signature in UCP/ACP module
[ticket/12664] Refactor develop/migration_tips.php into a console command.

PHPBB3-12664
Merge pull request #2569 from bantu/ticket/12664

[ticket/12664] Refactor develop/migration_tips.php into a console command.

* bantu/ticket/12664:
  [ticket/12664] Refactor develop/migration_tips.php into a console command.
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12664] Refactor develop/migration_tips.php into a console command.
[ticket/12508] Remove extension manager from finder

PHPBB3-12508
[ticket/12508] Fix usages of the finder

PHPBB3-12508
[ticket/12508] Move \phpbb\extension\finder to \phpbb\finder

PHPBB3-12508
[ticket/12508] Fix class doc block

PHPBB3-12508
[ticket/12508] Only take a list of names for set_extensions()

PHPBB3-12508
[ticket/12508] Add a unit test for set_extensions()

PHPBB3-12508
[ticket/12508] Add new line to separate the if and foreach better

PHPBB3-12508
[ticket/12508] Fix doc block

PHPBB3-12508
[ticket/12508] Ignore extensions in migration_tips dev tool

PHPBB3-12508
[ticket/12646] Add check for navlinks.FORUM_ID

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[ticket/12646] Changed to navlinks.MICRODATA

PHPBB3-12646
[ticket/11711] Improve coding and comments of character check

PHPBB3-11711
[ticket/12687] Add a constant to display the load time without DEBUG

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[ticket/12687] Display the explain link only when DEBUG is set

PHPBB3-12687
Merge remote-tracking branch 'github-nickvergessen/ticket/12508' into develop-ascraeus

* github-nickvergessen/ticket/12508:
  [ticket/12508] Ignore extensions in migration_tips dev tool
  [ticket/12508] Fix doc block
  [ticket/12508] Add new line to separate the if and foreach better
  [ticket/12508] Add a unit test for set_extensions()
  [ticket/12508] Only take a list of names for set_extensions()
  [ticket/12508] Fix class doc block
  [ticket/12508] Move \phpbb\extension\finder to \phpbb\finder
  [ticket/12508] Fix usages of the finder
  [ticket/12508] Remove extension manager from finder
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12508] Ignore extensions in migration_tips dev tool
  [ticket/12508] Fix doc block
  [ticket/12508] Add new line to separate the if and foreach better
  [ticket/12508] Add a unit test for set_extensions()
  [ticket/12508] Only take a list of names for set_extensions()
  [ticket/12508] Fix class doc block
  [ticket/12508] Move \phpbb\extension\finder to \phpbb\finder
  [ticket/12508] Fix usages of the finder
  [ticket/12508] Remove extension manager from finder