Placeholders and API

With PlaceholderAPI: %roodyvanishzones_zone% (id of the player's zone, empty if none), _zone_name, _in_zone (true/false), _bypass (true/false), _hidden (players they do not see), _hidden_from (players who do not see them) and _players_<zone> (players in that zone).

For developers (softdepend: [RoodyVanishZones]): the class dev.roody.roodyvanishzones.api.VanishZones (getZone(player), canSee(viewer, target), isHidden, getPlayersIn, setBypass, refresh) and the events VanishZoneEnterEvent, VanishZoneLeaveEvent and VanishZoneVisibilityEvent (change whether one player sees another, for a party plugin for example).