Update from upstream SpigotMC

Add unbreakable API to item meta SpigotMC/Spigot@b1af008222
Configure how often EntityHangings calculate if they should die. SpigotMC/Spigot@ac6e1fc32d
Copy ItemStacks in DataWatcher to prevent ConcurrentModificationExcep… SpigotMC/Spigot@2af28ffbd1
Add the spigot.yml into the timings paste SpigotMC/Spigot@d61f38bd58

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

Spigot-Server-Patches/Remove-invalid-mob-spawner-tile-entities.patch

@@ -25,8 +25,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
 +++ b/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperSpigotWorldConfig
-         hangingTickFrequency = getInt( "hanging-tick-frequency", 100);
-         log( "Hanging entities tick frequency: " + hangingTickFrequency);
+         waterOverLavaFlowSpeed = getInt( "water-over-lava-flow-speed", 5 );
+         log( "Water over lava flow speed: " + waterOverLavaFlowSpeed);
      }
 +
 +    public boolean removeInvalidMobSpawnerTEs;