Shoot or Shout! - Darkness, torches, MORE JUICE

Hi! Sssssmall updates:
- Spitters don't spawn on already occupied spawnpoints, yay (they don't shoot shoot  acidballs now, not yay)

- Changed the tiles completely!

- Made the overall game darker and added some little torches!

Future updates:
- Adding dual gunning powerup!
- Adding some nice FX to the spawning of zombies (they just..appear you know, pretty weird)