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/Fix-Old-Sign-Conversion.patch

@@ -9,7 +9,7 @@ Subject: [PATCH] Fix Old Sign Conversion
    This causes Igloos and such to render broken signs. We fix this by ignoring sign conversion for Defined Structures
 
 diff --git a/src/main/java/net/minecraft/server/DefinedStructure.java b/src/main/java/net/minecraft/server/DefinedStructure.java
-index 9f314204..23da9467 100644
+index 9f314204b..23da9467e 100644
 --- a/src/main/java/net/minecraft/server/DefinedStructure.java
 +++ b/src/main/java/net/minecraft/server/DefinedStructure.java
 @@ -0,0 +0,0 @@ public class DefinedStructure {
@@ -34,7 +34,7 @@ index 9f314204..23da9467 100644
  
          public Iterator<IBlockData> iterator() {
 diff --git a/src/main/java/net/minecraft/server/TileEntity.java b/src/main/java/net/minecraft/server/TileEntity.java
-index 393c9089..237f7e6f 100644
+index 65297a761..537e4b155 100644
 --- a/src/main/java/net/minecraft/server/TileEntity.java
 +++ b/src/main/java/net/minecraft/server/TileEntity.java
 @@ -0,0 +0,0 @@ import org.bukkit.inventory.InventoryHolder; // CraftBukkit
@@ -46,7 +46,7 @@ index 393c9089..237f7e6f 100644
      private static final RegistryMaterials<MinecraftKey, Class<? extends TileEntity>> f = new RegistryMaterials();
      protected World world;
 diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
-index 77a7b445..54b719d9 100644
+index 77a7b4458..54b719d91 100644
 --- a/src/main/java/net/minecraft/server/TileEntitySign.java
 +++ b/src/main/java/net/minecraft/server/TileEntitySign.java
 @@ -0,0 +0,0 @@ public class TileEntitySign extends TileEntity {