#29 : Fixed rendering bug with non-death, non-lightning beams.
#29 : Generalize death ray dark-beam code. Fix render bug with death
rays.
#29 : Fixed rendering bug in lightning beams.
#29 : Optimize & clean up the beam rendering.
#29 : Renamed things to clarify that the textures are for the glow, not
the beam.
#29 : Reworked the glow textures.
#29 : Overlay a second texture on beams to give a more defined core.
#29 :
#29 : Added noise texture & rendering code for it.
#29 : Refactored how the beam/bolt textures are defined.
#29 : Added a cap to the start of beams to hide the polygons.
#29 : Added core, noise & start cap to lightning beam.
Finish beam-rendering. Fixes #29.