added Command "/gills" & registered it

this is a slightly modified version of "/nv"

BauSystem_Main/src/de/steamwar/bausystem/BauSystem.java

@@ -88,6 +88,7 @@ public class BauSystem extends JavaPlugin implements Listener {
         getCommand("skull").setExecutor(new CommandSkull());
         getCommand("loader").setExecutor(new CommandLoader());
         getCommand("lockschem").setExecutor(new CommandLockschem());
+        getCommand("gills").setExecutor(new CommandGills());
 
         Bukkit.getPluginManager().registerEvents(this, this);
         Bukkit.getPluginManager().registerEvents(new RegionListener(), this);

BauSystem_Main/src/de/steamwar/bausystem/commands/CommandGills.java

@@ -0,0 +1,31 @@
+package de.steamwar.bausystem.commands;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+
+import de.steamwar.bausystem.BauSystem;
+
+public class CommandGills implements CommandExecutor {
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        if(!(sender instanceof Player))
+            return false;
+        Player player = (Player) sender;
+
+        for(PotionEffect effect : player.getActivePotionEffects()){
+            if(effect.getType().equals(PotionEffectType.WATER_BREATHING)){
+                player.sendMessage(BauSystem.PREFIX + "Kiemen deaktiviert");
+                player.removePotionEffect(PotionEffectType.WATER_BREATHING);
+                return false;
+            }
+        }
+        player.addPotionEffect(new PotionEffect(PotionEffectType.WATER_BREATHING, 1000000, 255, false, false));
+        player.sendMessage(BauSystem.PREFIX + "Kiemen aktiviert");
+        return false;
+    }
+}