Updated Upstream (Bukkit/CraftBukkit)

Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
39ce5d3a SPIGOT-4399: ItemMeta.equals broken with AttributeModifiers

CraftBukkit Changes:
1cf8b5dc SPIGOT-4400: Populators running on existing chunks
116cb9a1 SPIGOT-4399: Add attribute modifier equality test
5ee1c18a SPIGOT-4398: Set ASM7_EXPERIMENTAL flag

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

@@ -6,7 +6,7 @@ Subject: [PATCH] Optimize Chunk#getPos
 Don't create an object just to get chunk coords.
 
 diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
-index c006cc9778..e90ce79a97 100644
+index 6f8e6db820..82d8aca47f 100644
 --- a/src/main/java/net/minecraft/server/Chunk.java
 +++ b/src/main/java/net/minecraft/server/Chunk.java
 @@ -0,0 +0,0 @@ public class Chunk implements IChunkAccess {
@@ -19,7 +19,7 @@ index c006cc9778..e90ce79a97 100644
 +    private final ChunkCoordIntPair chunkCoords; // Paper
      public org.bukkit.Chunk bukkitChunk;
      public boolean mustSave;
-     public boolean newChunk;
+     private boolean needsDecoration;
 @@ -0,0 +0,0 @@ public class Chunk implements IChunkAccess {
      }