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/Make-entities-look-for-hoppers.patch

@@ -250,7 +250,7 @@ index 804215a1c..e830d8390 100644
 +    double G(); default double getZ() { return G(); } // Paper - OBFHELPER
  }
 diff --git a/src/main/java/net/minecraft/server/TileEntityHopper.java b/src/main/java/net/minecraft/server/TileEntityHopper.java
-index 53584b257..8ad081316 100644
+index 985513511..e9315f2d5 100644
 --- a/src/main/java/net/minecraft/server/TileEntityHopper.java
 +++ b/src/main/java/net/minecraft/server/TileEntityHopper.java
 @@ -0,0 +0,0 @@ public class TileEntityHopper extends TileEntityLootable implements IHopper, ITi