Merge branch '6.4' into 7.0

* 6.4: (31 commits)
  [HttpKernel] Strip exception file paths from log messages
  [Validator] Add ability to validate time without seconds
  [Process] Fix test case
  [Process] Support finding executables independently of open_basedir
  [Mime] Update mimetypes
  Add some PHPDoc
  [Workflow] Add a profiler
  [Form] Removing self-closing slash from `<input>`
  [FrameworkBundle][Serializer] Add TranslatableNormalizer
  [Uid] Fix example
  [HttpKernel] Add `reset()` implementation in DataCollector
  [Uid] Add more PHP doc to "export" functions
  [HttpKernel] RequestPayloadValueResolver Add support for custom http status code
  [Serializer] Add support for seld/jsonlint in order to enhance error messages
  [Workflow] fix MermaidDumper when place contains special char
  [Translation] Phrase translation provider
  [Workflow] Add support for storing the marking in a property
  [Crawler] Fix regression where cdata nodes will return empty string
  [Scheduler] make `ScheduledStamp` "send-able"
  [Serializer] Groups annotation/attribute on class
  ...

Author: nicolas-grekas