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/ShulkerBox-Dupe-Prevention.patch

@@ -7,7 +7,7 @@ This ensures that Shulker Boxes can never drop their contents twice, and
 that the inventory is cleared incase it some how also got saved to the world.
 
 diff --git a/src/main/java/net/minecraft/server/BlockShulkerBox.java b/src/main/java/net/minecraft/server/BlockShulkerBox.java
-index 8811eb3e..74e2e448 100644
+index 8811eb3e3..74e2e448f 100644
 --- a/src/main/java/net/minecraft/server/BlockShulkerBox.java
 +++ b/src/main/java/net/minecraft/server/BlockShulkerBox.java
 @@ -0,0 +0,0 @@ public class BlockShulkerBox extends BlockTileEntity {