Updated Upstream (Bukkit/CraftBukkit/Spigot)

Upstream has released updates that appears to apply and compile correctly.

This update has been tested to ensure that World Conversion still occurs correctly.

Bukkit Changes:
0812ce2c SPIGOT-4397: isChunkGenerated API

CraftBukkit Changes:
4824655c SPIGOT-4398: Upgrade to ASM 6.2.1 for better Java 11 support
eea43870 MC-134115: Fix issues converting tile entities
1a7f2d10 SPIGOT-4397: isChunkGenerated API
40aed54d SPIGOT-4396: Improve vehicle movement

Spigot Changes:
f6a273b1 Rebuild patches

Spigot-API-Patches/isChunkGenerated-API.patch

@@ -33,7 +33,7 @@ index 7e1ee875e..9457832bc 100644
      /**
       * Sets the position of this Location and returns itself
 diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
-index 348f1c98d..9c06fc163 100644
+index c918c26be..d367e890f 100644
 --- a/src/main/java/org/bukkit/World.java
 +++ b/src/main/java/org/bukkit/World.java
 @@ -0,0 +0,0 @@ public interface World extends PluginMessageRecipient, Metadatable {
@@ -50,15 +50,6 @@ index 348f1c98d..9c06fc163 100644
 +    public default boolean isChunkGenerated(long chunkKey) {
 +        return isChunkGenerated((int) chunkKey, (int) (chunkKey >> 32));
 +    }
-+
-+    /**
-+     * Checks if a {@link Chunk} has been generated at the given coordinates.
-+     *
-+     * @param x X-coordinate of the chunk
-+     * @param z Z-coordinate of the chunk
-+     * @return true if the chunk has been generated, otherwise false
-+     */
-+    public boolean isChunkGenerated(int x, int z);
 +
      /**
       * This is the Legacy API before Java 8 was supported. Java 8 Consumer is provided,