Don't allow world unloading while ticking worlds (fixes #8080) (#8081)

patches/server/0904-Throw-exception-on-world-create-while-being-ticked.patch

@@ -35,7 +35,7 @@ index ed799a59411d637d0f50a62c73e2b23053fbcb0e..77cd45f616e2ff38ad6a648b8b865a99
          this.profiler.popPush("connection");
          MinecraftTimings.connectionTimer.startTiming(); // Spigot
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index 925c9359a3e33abfdc6463572b96191381cec480..6e4ccdcd1e9d3be217f26ad187300e15531fe811 100644
+index a8ed075021088d86753e0340ee23698191ee07e0..57da844bc8993d7eb8850df3696a8870600a8603 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 @@ -1135,6 +1135,7 @@ public final class CraftServer implements Server {
@@ -46,3 +46,11 @@ index 925c9359a3e33abfdc6463572b96191381cec480..6e4ccdcd1e9d3be217f26ad187300e15
          Validate.notNull(creator, "Creator may not be null");
  
          String name = creator.name();
+@@ -1259,6 +1260,7 @@ public final class CraftServer implements Server {
+ 
+     @Override
+     public boolean unloadWorld(World world, boolean save) {
++        Preconditions.checkState(!this.console.isIteratingOverLevels, "Cannot unload a world while worlds are being ticked"); // Paper
+         if (world == null) {
+             return false;
+         }

patches/server/0915-Don-t-broadcast-messages-to-command-blocks.patch

@@ -20,10 +20,10 @@ index c0195f73cd2c8721e882c681eaead65471710081..861b348f73867af3199f1cc0dab1ddd4
              Date date = new Date();
  
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index 6e4ccdcd1e9d3be217f26ad187300e15531fe811..61c2f864bb23e75f6c377f7ccbf2ec44a670348c 100644
+index 57da844bc8993d7eb8850df3696a8870600a8603..f6f4e7f393cdd03f0ec699ff461e1ac20ddef789 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-@@ -1753,7 +1753,7 @@ public final class CraftServer implements Server {
+@@ -1754,7 +1754,7 @@ public final class CraftServer implements Server {
          // Paper end
          Set<CommandSender> recipients = new HashSet<>();
          for (Permissible permissible : this.getPluginManager().getPermissionSubscriptions(permission)) {