Update upstream BD/B/CB/S

Note to other developers: This commit may require you to wipe your
workspace as a result of the changes to BD.

--- work/BuildData
Submodule work/BuildData f527a8ff..d56672db:
  > Mappings Update

--- work/Bukkit
Submodule work/Bukkit 0c1d258bb..db06c80d7:
  > Add list of entities to EntityTransformEvent
  > SPIGOT-4347: Add API to allow storing arbitrary values on ItemStacks

---work/CraftBukkit
Submodule work/CraftBukkit 6a398ac44..068dab5be:
  > Enable optional source JAR shading via profile shadeSourcesJar
  > Use ImmutableList rather than AbstractList for CraftMetaBook
  > Fix setRecipes(List) not setting Knowledge Book recipes.
  > Mappings Update
  > Add list of entities to EntityTransformEvent & move die calls
  > SPIGOT-4347: Add API to allow storing arbitrary values on ItemStacks
  > Add Vanilla help to default permissions

--- work/Spigot
Submodule work/Spigot a1f2566f6..e769fe4d9:
  > Mappings Update
  > Rebuild patches

Spigot-Server-Patches/Optimize-Chunk-Access.patch

@@ -9,7 +9,7 @@ getChunkAt is called for the same chunk multiple times in a row, often from getT
 Optimize this look up by using a Last Access cache.
 
 diff --git a/src/main/java/net/minecraft/server/ChunkMap.java b/src/main/java/net/minecraft/server/ChunkMap.java
-index 7ac07ac07ac0..7ac07ac07ac0 100644
+index ca18901df..2ebb2d834 100644
 --- a/src/main/java/net/minecraft/server/ChunkMap.java
 +++ b/src/main/java/net/minecraft/server/ChunkMap.java
 @@ -0,0 +0,0 @@ public class ChunkMap extends Long2ObjectOpenHashMap<Chunk> {
@@ -69,9 +69,9 @@ index 7ac07ac07ac0..7ac07ac07ac0 100644
 +    // Paper end
  
      public Chunk a(Object object) {
-         return this.a(((Long) object).longValue());
+         return this.a((Long) object);
 diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
-index 7ac07ac07ac0..7ac07ac07ac0 100644
+index 557aa5180..1d08ec37f 100644
 --- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
 +++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
 @@ -0,0 +0,0 @@ public class ChunkProviderServer implements IChunkProvider {