Improve Priority handling of neighbor chunks

Restores vanilla like behavior where neighbor chunks have less priority than the source chunk.

This resolves the issue where teleporting sometimes has the chunk your arriving in slow to send.

Also improves light tasks to always process tasks when tasks from the current priority level are collected
instead of bundling them.

Spigot-Server-Patches/Implement-Chunk-Priority-Urgency-System-for-Chunks.patch

@@ -687,7 +687,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    private int getNeighborsPriority() {
-+        return neighborPriorities.isEmpty() ? getMyPriority() : getDemandedPriority();
++        return (neighborPriorities.isEmpty() ? getMyPriority() : getDemandedPriority()) + 1;
 +    }
 +
 +    public void onNeighborRequest(PlayerChunk neighbor, ChunkStatus status) {