[ticket/12775] Add a conter_factory class and remove functions_container

PHPBB3-12775
[ticket/12775] Add customs parameters

PHPBB3-12775
[ticket/12775] Don't assign $container to null

PHPBB3-12775
[ticket/12775] Add a config.php class (and service)

PHPBB3-12775
[ticket/12775] Add get() and get_all() into config_php

PHPBB3-12775
[ticket/12775] Use the config.php handler in \phpbb\config_php

PHPBB3-12775
[ticket/12775] Rename the variables into common.php

PHPBB3-12775
[ticket/12775] Fix config_php::load_config_file()

PHPBB3-12775
[ticket/12775] Update phpBB/bin/phpbbcli.php

PHPBB3-12775
[ticket/12775] Update phpBB/download/file.php

PHPBB3-12775
[ticket/12775] Update phpBB/install/database_update.php

PHPBB3-12775
[ticket/12775] Update phpBB/install/index.php

PHPBB3-12775
[ticket/12775] Skip the tests related to the container

PHPBB3-12775
[ticket/12775] Load the config file before constants.php

PHPBB3-12775
[ticket/12775] Update container and config in install/

PHPBB3-12775
[ticket/12775] Use a field instead of a local var in load_config_var()

PHPBB3-12775
[ticket/12775] Add tests for the container factory

PHPBB3-12775
[ticket/12775] Add tests for \phpbb\config_php

PHPBB3-12775
[ticket/12775] Fix unit tests

PHPBB3-12775
[ticket/12775] Remove the last include of functions_container

PHPBB3-12775