feat: transition to VexlioHub, clean up modules, add effects & localize configs

- Rename and relocate package from DeluxeHubReloaded to VexlioHub
- Remove deprecated modules: antiwdl, scoreboard, tablist, pvp_mode, teleportation_bow, anti_swear, lockchat, vanish, holograms
- Refactor all commands to standard Bukkit CommandExecutor/TabCompleter registered dynamically via Bukkit CommandMap
- Add particle, sound, and trail configurations for launchpad and double jump modules
- Implement actionbar announcements and join title welcome animation modules
- Fully customize, translate to Czech, and restyle all configuration files in the 'uprava/' directory with the purple-cyan gradient theme

src/main/java/eu/milujukockoholky/vexliolobby/utility/PlaceholderUtil.java

@@ -0,0 +1,33 @@
+package eu.milujukockoholky.vexliolobby.utility;
+
+import me.clip.placeholderapi.PlaceholderAPI;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+
+public class PlaceholderUtil {
+
+	public static boolean PAPI;
+
+	public static String setPlaceholders(String text, Player player) {
+
+		if (text.contains("%player%") && player != null) text = text.replace("%player%", player.getName());
+
+		if (text.contains("%online%"))
+			text = text.replace("%online%", String.valueOf(Bukkit.getServer().getOnlinePlayers().size()));
+
+		if (text.contains("%online_max%"))
+			text = text.replace("%online_max%", String.valueOf(Bukkit.getServer().getMaxPlayers()));
+
+		if (text.contains("%location%") && player != null) {
+			Location location = player.getLocation();
+			text = text.replace("%location%", location.getBlockX() + ", " + location.getBlockY() + ", " + location.getBlockZ());
+		}
+
+		if (PAPI && player != null) text = PlaceholderAPI.setPlaceholders(player, text);
+
+		return text;
+
+	}
+
+}