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/Add-ray-tracing-methods-to-LivingEntity.patch

@@ -5,7 +5,7 @@ Subject: [PATCH] Add ray tracing methods to LivingEntity
 
 
 diff --git a/src/main/java/net/minecraft/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
-index 21d32178c..2aedfa808 100644
+index 1dcb9a7e9..5ea5d4b78 100644
 --- a/src/main/java/net/minecraft/server/EntityLiving.java
 +++ b/src/main/java/net/minecraft/server/EntityLiving.java
 @@ -0,0 +0,0 @@ public abstract class EntityLiving extends Entity {
@@ -31,18 +31,6 @@ index 21d32178c..2aedfa808 100644
      public int shieldBlockingDelay = world.paperConfig.shieldBlockingDelay;
  
      public int getShieldBlockingDelay() {
-diff --git a/src/main/java/net/minecraft/server/MovingObjectPosition.java b/src/main/java/net/minecraft/server/MovingObjectPosition.java
-index 6d5dbe89a..a31f9f607 100644
---- a/src/main/java/net/minecraft/server/MovingObjectPosition.java
-+++ b/src/main/java/net/minecraft/server/MovingObjectPosition.java
-@@ -0,0 +0,0 @@ public class MovingObjectPosition {
-         this.pos = vec3d;
-     }
- 
-+    public BlockPosition getBlockPosition() { return a(); } // Paper - OBFHELPER
-     public BlockPosition a() {
-         return this.e;
-     }
 diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
 index 52834b6da..eeab59379 100644
 --- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java