Add more weapons

[saarshe]

More weapon types - more fun

Ideas:
Laser (instant hit, relatively fast, piercing? Maybe only at high level?)
Shotgun (spread, short range, damage scales with distance)
Sniper (slow and powerful)
Smg (weak but fast)
Missle (slow, powerful, explosion damage)
Poison (damage over time)
Electricity (bounce between enemies)
Ice (slow/freeze)