[ticket/11444] Moving the in-board notifications to a method class

Currently the in-board method for the notifications is hardcoded and
cannot be disabled. This method should be in his own class extending
`phpbb\notification\method\method_interface`.

It also add the possibility, for each method, to be enabled by default (ie:
no entry in the DB => notification enabled).

https://tracker.phpbb.com/browse/PHPBB3-11444
https://tracker.phpbb.com/browse/PHPBB3-11967

PHPBB3-11444

phpBB/language/en/acp/board.php

@@ -99,6 +99,7 @@ $lang = array_merge($lang, array(
 	'ALLOW_TOPIC_NOTIFY'		=> 'Allow subscribing to topics',
 	'BOARD_PM'					=> 'Private messaging',
 	'BOARD_PM_EXPLAIN'			=> 'Enable private messaging for all users.',
+	'ALLOW_BOARD_NOTIFICATIONS' => 'Allow board notifications',
 ));
 
 // Avatar Settings

phpBB/language/en/common.php

@@ -447,6 +447,7 @@ $lang = array_merge($lang, array(
 	'NOTIFICATION_FORUM'				=> '<em>Forum:</em> %1$s',
 	'NOTIFICATION_GROUP_REQUEST'		=> '<strong>Group request</strong> from %1$s to join the group %2$s.',
 	'NOTIFICATION_GROUP_REQUEST_APPROVED'	=> '<strong>Group request approved</strong> to join the group %1$s.',
+	'NOTIFICATION_METHOD_INVALID'		=> 'The method "%s" does not refer to a valid notification method.',
 	'NOTIFICATION_PM'					=> '<strong>Private Message</strong> from %1$s:',
 	'NOTIFICATION_POST'					=> array(
 		1	=> '<strong>Reply</strong> from %1$s in topic:',

phpBB/language/en/ucp.php

@@ -327,6 +327,7 @@ $lang = array_merge($lang, array(
 	'NOTIFICATION_GROUP_MODERATION'						=> 'Moderation Notifications',
 	'NOTIFICATION_GROUP_ADMINISTRATION'					=> 'Administration Notifications',
 	'NOTIFICATION_GROUP_POSTING'						=> 'Posting Notifications',
+	'NOTIFICATION_METHOD_BOARD'							=> 'Notifications',
 	'NOTIFICATION_METHOD_EMAIL'							=> 'Email',
 	'NOTIFICATION_METHOD_JABBER'						=> 'Jabber',
 	'NOTIFICATION_TYPE'									=> 'Notification type',