Merge branch 'feature/system-cron' into develop

* feature/system-cron: (67 commits)
  [feature/system-cron] More tests for cron manager.
  [feature/system-cron] Added documentation for cron manager constructor.
  [feature/system-cron] Remove an unecessary assignment and an unecessary comment
  [feature/system-cron] Clarify comments about flush() call in cron.
  [feature/system-cron] preg_match returns int so cast to bool, fix comment
  [feature/system-cron] Rename lock() to acquire and unlock() to release.
  [feature/system-cron] Cache cron's task names.
  [feature/system-cron] Use a RecursiveDirectoryIterator instead of readdir.
  [feature/system-cron] Add array type hints if appropriate and remove globals.
  [feature/system-cron] Make use of the new config class in locks.
  [feature/system-cron] Fix duplicate instantiation of class loader in tests.
  [feature/system-cron] Abstract the database locking mechanism out of cron.
  [feature/system-cron] Move tests to phpunit.xml and always load class loader
  [feature/system-cron] Basic tests for cron manager.
  [feature/system-cron] Added @param/@return documentation
  [feature/system-cron] Add phpDoc documentation for everything else.
  [feature/system-cron] Cast result in cron_manager::is_valid_name() to bool.
  [feature/system-cron] Add phpDoc documentation for phpbb_cron_manager class.
  [feature/system-cron] Add phpDoc documentation for phpbb_cron_lock class.
  [feature/system-cron] Adjust SQL query style to follow coding guidelines.
  ...

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