Adds Registry#getKey(Object) which should be the
primary way people get the key for an object. Registry
items need to exist without having a key and so
getKey() methods on Keyed objects that have a registry
are marked as Deprecated or Obsolete.
By removing this check we avoid unnecessarily allocating useless `ItemMeta` objects if we are comparing two items, or one of the two items, that don't have any durability. Don't worry, the durability of the item is checked when it checks if both item metas are equal.
This is a leftover from when checking for the item's durability was "free" because the durability was stored in the `ItemStack` itself, this [was changed in Minecraft 1.13](f8b2086d60 (src)/main/java/org/bukkit/inventory/ItemStack.java).
This adds an alternative to OfflinePlayer#isOnline that returns true only if the same instance of the player is still online. This is generally more useful than isOnline as it allows you to determine if you have an instance of a Player that still exists. If a player relogs an old Player instance becomes unlinked leading to e.g. messages sent to the old player no longer arriving despite isOnline returning true. Checking against isConnected is more useful there to discard invalid instances.
Pulling Folia API to Paper is primarily intended for plugins
that want to target both Paper and Folia without unnecessary
compatibility layers.
Add both a location based scheduler, an entity based scheduler,
and a global region scheduler.
Owned region API may be useful for plugins which want to perform
operations over large areas outside of the buffer zone provided
by the regionaliser, as it is not guaranteed that anything
outside of the buffer zone is owned. Then, the plugins may use
the schedulers depending on the result of the ownership check.
