Update project configuration and refactor codebase

- Migrated Minestom dependency to new groupId.
- Added Maven Shade plugin for packaging.
- Switched Java version to 21 and corrected JDK settings.
- Refactored terrain generation logic to use the updated Minestom API.
- Replaced deprecated particle creation methods.
- Enabled Velocity proxy support.
- Updated various configuration files to align with the new build setup.

src/main/java/eu/mhsl/minecraft/endlessjumper/EndlessJumper.java

@@ -6,12 +6,14 @@ import net.minestom.server.coordinate.Pos;
 import net.minestom.server.entity.Player;
 import net.minestom.server.entity.PlayerSkin;
 import net.minestom.server.event.GlobalEventHandler;
+import net.minestom.server.event.player.AsyncPlayerConfigurationEvent;
 import net.minestom.server.event.player.PlayerDisconnectEvent;
-import net.minestom.server.event.player.PlayerLoginEvent;
 import net.minestom.server.event.player.PlayerMoveEvent;
+import net.minestom.server.extras.velocity.VelocityProxy;
 import net.minestom.server.instance.InstanceContainer;
 import net.minestom.server.instance.InstanceManager;
 import net.minestom.server.instance.block.Block;
+import net.minestom.server.timer.TaskSchedule;
 
 import java.util.HashMap;
 
@@ -24,12 +26,12 @@ public class EndlessJumper {
 
         HashMap<Player, JumpGenerator> games = new HashMap<>();
 
-        eventHandler.addListener(PlayerLoginEvent.class, event -> {
+        eventHandler.addListener(AsyncPlayerConfigurationEvent.class, event -> {
             final Player p = event.getPlayer();
             p.setRespawnPoint(new Pos(0.5,101.5,0.5));
 
             final InstanceContainer world = instanceManager.createInstanceContainer();
-            world.setChunkGenerator(new TerrainGenerator());
+            world.setGenerator(new TerrainGenerator());
 
             Pos startingAt = new Pos(0,100,0);
             world.setBlock(startingAt, Block.DIAMOND_BLOCK);
@@ -41,7 +43,11 @@ public class EndlessJumper {
 
             event.setSpawningInstance(world);
 
-            games.put(p, new JumpGenerator(startingAt, p, world));
+            MinecraftServer.getSchedulerManager().scheduleTask(
+                () -> games.put(p, new JumpGenerator(startingAt, p, world)),
+                TaskSchedule.seconds(3),
+                TaskSchedule.stop()
+            );
         });
 
         eventHandler.addListener(PlayerMoveEvent.class, event -> {
@@ -70,11 +76,10 @@ public class EndlessJumper {
             //if(p.getPosition().z() > target.z()+2) generator.highlight();
         });
 
-        eventHandler.addListener(PlayerDisconnectEvent.class, event -> {
-           games.remove(event.getPlayer());
-        });
+        eventHandler.addListener(PlayerDisconnectEvent.class, event -> games.remove(event.getPlayer()));
 
-        server.start("0.0.0.0", 25565);
+        VelocityProxy.enable("iph0YHK9jNWZ");
+        server.start("0.0.0.0", 25501);
 
     }
 }