Merge branch '4.0'

* 4.0: (23 commits)
  Clean up
  Update return type in docblock.
  PHP CS Fixer: no need to exclude xml and yml files
  PHP CS Fixer: no need to exclude json file
  [#22749] fix version in changelog
  Update LICENSE year... forever
  fixed some deprecation messages
  fixed CS
  Fixes for Oracle in PdoSessionHandler
  fixed some deprecation messages
  fixed some deprecation messages
  fixed some deprecation messages
  fixed some deprecation messages
  Remove dead code
  [TwigBundle/Brige] catch missing requirements to throw meaningful exceptions
  [DI] fix CS
  [HttpKernel] Call Response->setPrivate() instead of sending raw header() when session is started
  [FrameworkBundle] Make cache:clear "atomic" and consistent with cache:warmup
  Suggest to write an implementation if the interface cannot be autowired
  [Debug] Skip DebugClassLoader checks for already parsed files
  ...

Author: nicolas-grekas

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2017 Fabien Potencier
+Copyright (c) 2004-present Fabien Potencier
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal