[ticket/11335] (class loader) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (controller/helper.php) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (extension manager/finder) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (hook finder) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (kernel request subscriber) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (avatars) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (tests) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (more class loader) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (more tests) Make php_ext 'php' not '.php'

PHPBB3-11335
[ticket/11335] (more) Make php_ext 'php' not '.php'

PHPBB3-11335