Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12691] Comment change
  [ticket/12691] Change event to core.delete_pm_before
  [ticket/12691] Add core.delete_pm to funtion delete_pm
Merge pull request #2597 from Skouat/ticket/12714

[ticket/12714] Switching the description of radio buttons to align the correct description above the listbox

* Skouat/ticket/12714:
  [ticket/12714] Move "allow all forums" in its own dd-element
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12714] Move "allow all forums" in its own dd-element
Merge pull request #2591 from rxu/ticket/12704

[ticket/12704] Improve the load time information in the footer when enabled

* rxu/ticket/12704:
  [ticket/12704] Improve the load time information in the footer when enabled
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12704] Improve the load time information in the footer when enabled
[ticket/12387] Fix \phpbb\db\driver\mysqli::sql_freeresult

PHPBB3-12387
Merge pull request #2629 from nickvergessen/ticket/12747

[ticket/12747] Drop support for Firebird

* nickvergessen/ticket/12747:
  [ticket/12747] Remove some methods which are not used anymore
  [ticket/12747] Drop support for Firebird

Conflicts:
	phpBB/phpbb/db/driver/firebird.php
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12747] Remove some methods which are not used anymore
  [ticket/12747] Drop support for Firebird
[ticket/12726] PSR2.Namespaces.NamespaceDeclaration

PHPBB3-12726
[ticket/12726] Ensure PHP files do not contain any unused use statements

PHPBB3-12726
[ticket/12726] Fix coding style

PHPBB3-12726
[ticket/12726] Update error message

PHPBB3-12726
[ticket/12726] Fix coding style

PHPBB3-12726
[ticket/12696] Typo

Fixing typo

PHPBB3-12696
[ticket/12387] Fix a call to sql_freeresult in full_text_native

PHPBB3-12387
Merge remote-tracking branch 'PayBas/ticket/12608' into develop-ascraeus

* PayBas/ticket/12608:
  [ticket/12608] Change CSS classes to prevent styling conflicts
  [ticket/12608] Add subSilver
  [ticket/12608] Changed get_styling() to get_style_class()
  [ticket/12608] Remove somewhat redundant reported color style
  [ticket/12608] Improved LTR and various bugfixes
  [ticket/12608] Clean up whitespace
  [ticket/12608] Add styling (CSS class) options to notifications
  [ticket/12608] Updated tests
  [ticket/12608] Improve notifications drop-down menu styling in header
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12608] Change CSS classes to prevent styling conflicts
  [ticket/12608] Add subSilver
  [ticket/12608] Changed get_styling() to get_style_class()
  [ticket/12608] Remove somewhat redundant reported color style
  [ticket/12608] Improved LTR and various bugfixes
  [ticket/12608] Clean up whitespace
  [ticket/12608] Add styling (CSS class) options to notifications
  [ticket/12608] Updated tests
  [ticket/12608] Improve notifications drop-down menu styling in header
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12726] Fix coding style
  [ticket/12726] Update error message
  [ticket/12726] Fix coding style
  [ticket/12726] Ensure PHP files do not contain any unused use statements
  [ticket/12726] PSR2.Namespaces.NamespaceDeclaration
Merge pull request #2625 from Nicofuma/ticket/12726

[ticket/12726] Add Code Sniffer sniff ensuring PHP files do not contain any unused use statements

* Nicofuma/ticket/12726:
  [ticket/12726] Fix coding style
  [ticket/12726] Update error message
  [ticket/12726] Fix coding style
  [ticket/12726] Ensure PHP files do not contain any unused use statements
  [ticket/12726] PSR2.Namespaces.NamespaceDeclaration
[ticket/12761] Remove the execute bit from functions_user.php

PHPBB3-12761