Update upstream CB/S

Spigot-Server-Patches/revert-Better-reloading-of-pending-unload-chunks.patch

@@ -1,25 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Shane Freeder <theboyetronic@gmail.com>
-Date: Sun, 8 Apr 2018 01:21:23 +0100
-Subject: [PATCH] revert "Better reloading of pending unload chunks"
-
-This change by spigot ensures that many interactins with chunks,
-e.g. getting a list of TEs will cause the chunk to be marked for not
-unloading and will block their unload. This is especially true for
-servers using Timings (it needs to access the TE list of chunks), or
-any plugins which need to access entity/TE lists periodically.
-
-diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
-index de859ffd1..1e84afb0a 100644
---- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
-+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
-@@ -0,0 +0,0 @@ public class ChunkProviderServer implements IChunkProvider {
-     }
- 
-     public Chunk getChunkAt(int i, int j, Runnable runnable, boolean generate) {
--        Chunk chunk = getLoadedChunkAt(i, j);
-+        Chunk chunk = getChunkIfLoaded(i, j); // Paper - revert "Better reloading of pending unload chunks" (see patch)
-         ChunkRegionLoader loader = null;
- 
-         if (this.chunkLoader instanceof ChunkRegionLoader) {
---