Update from upstream SpigotMC

Add unbreakable API to item meta SpigotMC/Spigot@b1af00822285467ed21ab51aac6fdf267dd83f75
Configure how often EntityHangings calculate if they should die. SpigotMC/Spigot@ac6e1fc32dc2139e9535d756830d9ac5547eccbf
Copy ItemStacks in DataWatcher to prevent ConcurrentModificationExcep… SpigotMC/Spigot@2af28ffbd1443eb70750ac8ea319b384d67f0ab4
Add the spigot.yml into the timings paste SpigotMC/Spigot@d61f38bd58bb0ac0cbe02dc323afdd85b1f5001a

Note: This commit moves the entity-hanging tick into Spigot's spigot.yml and out of our paper.yml