[TwigBridge] Update min. version of Twig

The minimal version of Twig must be 1.12 because of usage the method `Twig_SimpleFunction` that was added in that version.
[Twig Bridge] Fixed bug in ExpressionExtension
Merge branch '2.3' into 2.4

* 2.3: (30 commits)
  Update validators.ro.xlf
  add non-standard port to HTTP_HOST
  fixed attribute "source-language" for translations
  Update PluralizationRules.php
  Update validators.pt_BR.xlf
  Translated remaining items (57-72)
  Updated Vietnamese translation
  added missing dot in translation
  updated Arabic translations
  Update validators.id.xlf
  [Validator] Translate validator messages into Brazilian Portuguese
  Added more Swedish validator translations
  Update validators.ca.xlf
  fixed typos in Welsh translation
  Added missing Croatian translations
  [Form] fixed allow render 0 and 0.0 numeric input values
  Fixed validators.nl.xlf
  [Component/Security] Fixed some phpdocs in Security/Core
  Completed Luxembourgish translation
  Fixing the Logger deprecation notices to match the correct method name it should be informing of
  ...

Conflicts:
	src/Symfony/Bridge/Twig/composer.json
	src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/form_widget_simple.html.php
	src/Symfony/Component/Console/Application.php
Merge branch '2.4'

* 2.4: (35 commits)
  Update validators.ro.xlf
  add non-standard port to HTTP_HOST
  fixed attribute "source-language" for translations
  [Process] clarify idle timeout
  [Security] fix DI for SimpleFormAuthenticationListener
  Update PluralizationRules.php
  Update validators.pt_BR.xlf
  Translated remaining items (57-72)
  Updated Vietnamese translation
  allow null value in fragment handler
  added missing dot in translation
  updated Arabic translations
  Update validators.id.xlf
  [Validator] Translate validator messages into Brazilian Portuguese
  Added more Swedish validator translations
  Update validators.ca.xlf
  fixed typos in Welsh translation
  Added missing Croatian translations
  [Form] fixed allow render 0 and 0.0 numeric input values
  Fixed validators.nl.xlf
  ...

Conflicts:
	src/Symfony/Bridge/Twig/composer.json