Returns all keys for the group name group_name. The array of
returned keys will be NULL-terminated, so length may
optionally be NULL. In the event that the group_name cannot
be found, NULL is returned and error is set to
G_KEY_FILE_ERROR_GROUP_NOT_FOUND
Returns all keys for the group name group_name. The array of returned keys will be NULL-terminated, so length may optionally be NULL. In the event that the group_name cannot be found, NULL is returned and error is set to G_KEY_FILE_ERROR_GROUP_NOT_FOUND