Known bugs / TODO :
 * The laser beam can activate shootable switches
 * In vanilla, the laser beam leaves an invisible decal on walls, it's not visible
   but it still increments the decal count and is limited by the max number of decals allowed.
   However, it doesn't work in Zandronum... only UZDoom
 * There's a small vertical difference between the laser dot and the beam.
   This is because the laser is affected by bobbing, making it bounce up and
   down when moving. It is annoying to look at, so it was moved down to
   "fix" it, can be modified by the players using the laser_height CVar
