#660: Add support to change block's lid state

By: jameslfc19 <jameslfc19@gmail.com>

paper-server/nms-patches/TileEntityBarrel.patch

@@ -1,6 +1,6 @@
 --- a/net/minecraft/server/TileEntityBarrel.java
 +++ b/net/minecraft/server/TileEntityBarrel.java
-@@ -1,7 +1,54 @@
+@@ -1,7 +1,55 @@
  package net.minecraft.server;
  
 +// CraftBukkit start
@@ -21,6 +21,7 @@
 +    // CraftBukkit start - add fields and methods
 +    public List<HumanEntity> transaction = new ArrayList<>();
 +    private int maxStack = MAX_STACK;
++    public boolean opened;
 +
 +    @Override
 +    public List<ItemStack> getContents() {
@@ -55,3 +56,26 @@
      private NonNullList<ItemStack> items;
      private int b;
  
+@@ -100,7 +148,7 @@
+                 return;
+             }
+ 
+-            boolean flag = (Boolean) iblockdata.get(BlockBarrel.b);
++            boolean flag = (Boolean) iblockdata.get(BlockBarrel.b) && !opened; // CraftBukkit - only set flag if Barrel isn't set open by API.
+ 
+             if (flag) {
+                 this.a(iblockdata, SoundEffects.BLOCK_BARREL_CLOSE);
+@@ -118,11 +166,11 @@
+ 
+     }
+ 
+-    private void a(IBlockData iblockdata, boolean flag) {
++    public void a(IBlockData iblockdata, boolean flag) { // PAIL private -> public, rename setFlag
+         this.world.setTypeAndData(this.getPosition(), (IBlockData) iblockdata.set(BlockBarrel.b, flag), 3);
+     }
+ 
+-    private void a(IBlockData iblockdata, SoundEffect soundeffect) {
++    public void a(IBlockData iblockdata, SoundEffect soundeffect) { // PAIL private -> public, rename playSound
+         BaseBlockPosition baseblockposition = ((EnumDirection) iblockdata.get(BlockBarrel.a)).p();
+         double d0 = (double) this.position.getX() + 0.5D + (double) baseblockposition.getX() / 2.0D;
+         double d1 = (double) this.position.getY() + 0.5D + (double) baseblockposition.getY() / 2.0D;