Add option to disable some parts of screen on mobile

Sometimes when on mobile, your joystick slides over its activation area and you begin sliding your camera up, or you may miss the undefined line between the joystick and camera movement area. This is often detrimental to gameplay as it leads to you moving your camera fully up, leaving you vulnerable to mob attacks, especially those of creepers, which have lead to many deaths on my part. Being able to disable some parts of the screen, especially the part over the joystick, would stop this from happening and allow for better gameplay.