v1564 - Fan Traps and more...

FAN TRAPS
- drop updated
- physics updated
- spin up animation
- trap health
- trap destruction
- max ammo refills traps

BARRICADES:
- barbed wire barricade can now be reduced to rubble

GRENADES
- physics updated so explode closer

MERCHANT
- added rocket launcher

FIXES:
- projectiles no longer damage self

WEAPONS:
- improved 'edge of things' collision.