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/Hook-into-CB-plugin-rewrites.patch

@@ -8,7 +8,7 @@ our own relocation. Also lets us rewrite NMS calls for when we're
 debugging in an IDE pre-relocate.
 
 diff --git a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
-index 24d608399..212a50c88 100644
+index 875b4f77c..93e09e42f 100644
 --- a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
 +++ b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
 @@ -0,0 +0,0 @@ import java.io.FileOutputStream;
@@ -82,7 +82,7 @@ index 24d608399..212a50c88 100644
          OptionParser parser = new OptionParser();
 @@ -0,0 +0,0 @@ public class Commodore
  
-         cr.accept( new ClassVisitor( Opcodes.ASM7_EXPERIMENTAL, cw )
+         cr.accept( new ClassVisitor( Opcodes.ASM7, cw )
          {
 +            // Paper start - Rewrite plugins
 +            @Override