[Bleeding] Check that vanilla recipes actually exist. Fixes BUKKIT-5277

When falling back to vanilla recipes in the iteration of recipes,
a check is necessary to ensure that vanilla recipes are present.
RecipeIterator has been modified to account for the multi-map setup.
[Bleeding] Account for null in EntityDamageEvent handling. Fixes BUKKIT-5317

Damage caused by explosions will return null for the event as of
6588d6f72bbca74bf150de65593ac575b846111b. As such, a null check is
now necessary when handling non-living entity damage events.
 [Bleeding] Properly handle EntityBreakDoor event canceling. Fixes BUKKIT-5318

The method being called was renamed during the 1.4.2 update process
but the function call was not replaced accordingly, leading to a
missed diff from 314051580a0a8e4745d3a539f232b552916eb302.
Implement API for ServerListPingEvent. Adds BUKKIT-5121, BUKKIT-2465