[ticket/12039] Add config:* to the command line interface tool

PHPBB3-12039
[ticket/12039] Use an abstract class and some more minor adjustments

PHPBB3-12039
[ticket/12039] Fix option descriptions

PHPBB3-12039
[ticket/12039] Remove debug code

PHPBB3-12039
[ticket/12039] Update command descriptions

PHPBB3-12039
[ticket/12039] Do not colour returned value in get command

PHPBB3-12039
[ticket/12039] Do not print success message when config did not exist

PHPBB3-12039
[ticket/12039] Allow getting the value without a new line at the end

PHPBB3-12039
Merge pull request #1893 from nickvergessen/ticket/12039

[ticket/12039] Add config:* to the command line interface tool

* nickvergessen/ticket/12039:
  [ticket/12039] Allow getting the value without a new line at the end
  [ticket/12039] Do not print success message when config did not exist
  [ticket/12039] Do not colour returned value in get command
  [ticket/12039] Update command descriptions
  [ticket/12039] Remove debug code
  [ticket/12039] Fix option descriptions
  [ticket/12039] Use an abstract class and some more minor adjustments
  [ticket/12039] Add config:* to the command line interface tool