Optimize Hoppers

- Lots of itemstack cloning removed. Only clone if the item is actually moved
- Return true when a plugin cancels inventory move item event instead of false, as false causes pulls to cycle through all items.
  However, pushes do not exhibit the same behavior, so this is not something plugins could of been relying on.
- Add option (Default on) to cooldown hoppers when they fail to move an item due to full inventory
- Skip subsequent InventoryMoveItemEvents if a plugin does not use the item after first event fire for an iteration

Spigot-Server-Patches/Assign-the-World-in-WorldGenStronghold.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Assign the World in WorldGenStronghold
 
 
 diff --git a/src/main/java/net/minecraft/server/WorldGenStronghold.java b/src/main/java/net/minecraft/server/WorldGenStronghold.java
-index c9375470..a3b958e0 100644
+index c93754704..a3b958e01 100644
 --- a/src/main/java/net/minecraft/server/WorldGenStronghold.java
 +++ b/src/main/java/net/minecraft/server/WorldGenStronghold.java
 @@ -0,0 +0,0 @@ public class WorldGenStronghold extends StructureGenerator {