Merge branch '3.1' into 3.2v3.2.1

* 3.1: (28 commits)
  Fix merge
  [Validator] add class name to the cache key
  [Serializer] Remove AbstractObjectNormalizer::isAttributeToNormalize
  Throw less misleading exception when property access not found
  [Twig] Fix deprecations with Twig 1.29
  Fixed typo
  [FrameworkBundle] Removed the kernel.debug parameter from the cache pool namespace seed
  Fix email address
  fix the docblock in regard to the role argument
  Don't use the "app" global variable in the profiler
  [VarDumper] fix tests when xdebug is enabled
  Fix merge
  FIXED NON EXISTING TYPE DECLARATION
  [Cache] Fix dumping SplDoublyLinkedList iter mode
  [Console] fixed PHP7 Errors when not using Dispatcher
  Regression test for missing controller arguments (3.1)
  Regression test for missing controller arguments
  fix a test checking for a value
  [Form][DX] FileType "multiple" fixes
  fixed CS
  ...

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