SPIGOT-4900: Rearchitect multiworld support for better compat with new villager AI

By: md_5 <git@md-5.net>

paper-server/nms-patches/World.patch

@@ -23,7 +23,7 @@
  public abstract class World implements IIBlockAccess, GeneratorAccess, AutoCloseable {
  
      protected static final Logger LOGGER = LogManager.getLogger();
-@@ -41,14 +57,87 @@
+@@ -41,7 +57,51 @@
      protected boolean tickingTileEntities;
      private final WorldBorder worldBorder;
  
@@ -75,9 +75,8 @@
 +        // CraftBukkit end
          this.methodProfiler = gameprofilerfiller;
          this.worldData = worlddata;
--        this.worldProvider = dimensionmanager.getWorldProvider(this);
-+        this.worldProvider = DimensionManager.a(env.getId()).getWorldProvider(this); // CraftBukkit
-         this.chunkProvider = (IChunkProvider) bifunction.apply(this, this.worldProvider);
+         this.worldProvider = dimensionmanager.getWorldProvider(this);
+@@ -49,6 +109,35 @@
          this.isClientSide = flag;
          this.worldBorder = this.worldProvider.getWorldBorder();
          this.c = Thread.currentThread();