Lots of config change. It will automatic generated a new config file.

• Added location limit on placing or destroying blocks. It will only allow player change block there if you add this setting.
• Added bypass permission for location limit and block permission.

1. barrierplus.bypass.*
2. barrierplus.bypass.destroy
3. barrierplus.bypass.place

• Added Automatically check for updates after the server starts or when an operator with "barrierplus.command.version" permission joins the server,
• Added command /barrierplus help - Display help menu. It will hide the commands if player doesn't have the commands permissions.
  
• Added command /barrierplus version - Display the plugin version and check for updates.
• Added lots of custom messages.
• Fixed some small errors.