[ticket/12602] Add files to print the cron list and test files.

PHPBB3-12602
[ticket/12602] Correction of the output message for the cron list

PHPBB3-12602
[ticket/12602] Add function get_tasks.

PHPBB3-12602
[ticket/12602] Cleanup tests

PHPBB3-12602
Merge pull request #3 from Nicofuma/Stephannos-ticket/12602

[ticket/12602] Cleanup tests
[ticket/12602] Changes to respect coding style and to factorize code.

PHPBB3-12602
[ticket/12602] Headers updated.

PHPBB3-12602
[ticket/12602] Fix coding style mistakes.

PHPBB3-12602
[ticket/12602] Coding style correction.

PHPBB3-12602
[ticket/12602] Fix spaces issues.

PHPBB3-12602
[ticket/12602] Fix internationalisation of cron_list.php

PHPBB3-12602
[ticket/12602] Add types, change description of cron:list.

PHPBB3-12602
[ticket/12602] Fix language var mistakes.

PHPBB3-12602
[ticket/12602] Fix test mistake.

PHPBB3-12602
[ticket/12602] Rectify language keys.

PHPBB3-12602
[ticket/12602] Fix language key removal.

PHPBB3-12602
Merge pull request #2509 from Stephannos/ticket/12602

[ticket/12602] Add command to print the cron list

* Stephannos/ticket/12602:
  [ticket/12602] Fix language key removal.
  [ticket/12602] Rectify language keys.
  [ticket/12602] Fix test mistake.
  [ticket/12602] Fix language var mistakes.
  [ticket/12602] Add types, change description of cron:list.
  [ticket/12602] Fix internationalisation of cron_list.php
  [ticket/12602] Fix spaces issues.
  [ticket/12602] Coding style correction.
  [ticket/12602] Fix coding style mistakes.
  [ticket/12602] Headers updated.
  [ticket/12602] Changes to respect coding style and to factorize code.
  [ticket/12602] Cleanup tests
  [ticket/12602] Add function get_tasks.
  [ticket/12602] Correction of the output message for the cron list
  [ticket/12602] Add files to print the cron list and test files.