Update to Minecraft 1.15

By: md_5 <git@md-5.net>

paper-server/nms-patches/BlockPiston.patch

@@ -1,8 +1,8 @@
 --- a/net/minecraft/server/BlockPiston.java
 +++ b/net/minecraft/server/BlockPiston.java
-@@ -6,6 +6,14 @@
- import java.util.List;
- import java.util.Set;
+@@ -7,6 +7,14 @@
+ import java.util.Map;
+ import java.util.Map.Entry;
  
 +// CraftBukkit start
 +import com.google.common.collect.ImmutableList;
@@ -15,7 +15,7 @@
  public class BlockPiston extends BlockDirectional {
  
      public static final BlockStateBoolean EXTENDED = BlockProperties.g;
-@@ -112,6 +120,18 @@
+@@ -113,6 +121,18 @@
                  }
              }
  
@@ -31,13 +31,13 @@
 +            }
 +            // PAIL: checkME - what happened to setTypeAndData?
 +            // CraftBukkit end
-             world.playBlockAction(blockposition, this, b0, enumdirection.a());
+             world.playBlockAction(blockposition, this, b0, enumdirection.b());
          }
  
-@@ -281,6 +301,48 @@
+@@ -284,6 +304,48 @@
+             int j = list.size() + list2.size();
              IBlockData[] aiblockdata = new IBlockData[j];
              EnumDirection enumdirection1 = flag ? enumdirection : enumdirection.opposite();
-             Set<BlockPosition> set = Sets.newHashSet(list);
 +            // CraftBukkit start
 +            final org.bukkit.block.Block bblock = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
 +