[ticket/13266] Enable twig dump function

PHPBB3-13266
[ticket/13266] Merge pull request #3099 from Senky/ticket/13266

[ticket/13266] Enabling twig dump function if DEBUG is defined

* Senky/ticket/13266:
  [ticket/13266] Enable twig dump function

Conflicts:
	phpBB/phpbb/template/twig/twig.php

PHPBB3-13266
[ticket/13266] Enable the debug extension in the development environment

PHPBB3-13266
Merge pull request #3099 from Senky/ticket/13266

[ticket/13266] Enabling twig dump function if DEBUG is defined
Merge pull request #3170 from Nicofuma/ticket/13266-develop

[ticket/13266-develop] Enable twig dump function
Merge branch 'develop-ascraeus' into develop