[ticket/12839] Include update related templates and assets in the package

PHPBB3-12839
Merge pull request #2723 from nickvergessen/ticket/12839

[ticket/12839] Include update related templates and assets in the package

* nickvergessen/ticket/12839:
  [ticket/12839] Include update related templates and assets in the package
[prep-release-3.1.0-RC2] Update version to 3.1.0-RC2
[prep-release-3.1.0-RC2] Add migration for 3.1.0-RC2
[prep-release-3.1.0-RC2] Prepare Changelog
[prep-release-3.1.0-RC2] Add changelog for 3.1.0-RC2
[prep-release-3.1.0-RC2] Update phpBB Version for RC3 development
Merge branch 'prep-release-3.1.0-RC2' into develop-ascraeus

* prep-release-3.1.0-RC2:
  [prep-release-3.1.0-RC2] Update phpBB Version for RC3 development
  [prep-release-3.1.0-RC2] Add changelog for 3.1.0-RC2
  [prep-release-3.1.0-RC2] Prepare Changelog
  [prep-release-3.1.0-RC2] Add migration for 3.1.0-RC2
  [prep-release-3.1.0-RC2] Update version to 3.1.0-RC2
[ticket/12842] Skip parameters without exlicit type

PHPBB3-12842
Merge pull request #2725 from Nicofuma/ticket/12842

[ticket/12842] Out of memory issue in code sniffer call for extensions

* Nicofuma/ticket/12842:
  [ticket/12842] Skip parameters without exlicit type
[ticket/12844] Don't clear $dbpasswd early in connection manager

PHPBB3-12844
Merge pull request #2727 from Nicofuma/ticket/12844

[ticket/12844] Don't clear $dbpasswd early in connection manager

* Nicofuma/ticket/12844:
  [ticket/12844] Don't clear $dbpasswd early in connection manager