Several fixes and new api for experience merging/stacking (#9242)

patches/server/0516-Expose-protocol-version.patch

@@ -0,0 +1,22 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Nassim Jahnke <nassim@njahnke.dev>
+Date: Fri, 26 Mar 2021 11:23:17 +0100
+Subject: [PATCH] Expose protocol version
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+index 7e8bd8204dcdc64897464331c99eae25b127d30c..28f8a85c35c9c160bb223b8cd4245949b259dd5c 100644
+--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
++++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+@@ -545,6 +545,11 @@ public final class CraftMagicNumbers implements UnsafeValues {
+     public String getMainLevelName() {
+         return ((net.minecraft.server.dedicated.DedicatedServer) net.minecraft.server.MinecraftServer.getServer()).getProperties().levelName;
+     }
++
++    @Override
++    public int getProtocolVersion() {
++        return net.minecraft.SharedConstants.getCurrentVersion().getProtocolVersion();
++    }
+     // Paper end
+ 
+     @Override