Changed atom's bullet_act to call the projectile's on_hit, and changed
most bullet_acts to call on_hit as well. Removed some now-unnecessary
snowflake code.
These changes will make projectiles which should effect non-mobs, such
as the gyrojet and the ion rifle, work properly. Inanimate objects can
now be empulsed with the ion rifle, whose projectiles used to dissipate
on hitting anything but a mob. Gyrojets now explode on most objects, as
opposed to just on walls and mobs, and the snowflake code that made them
work on walls is no longer necessary. The code for pulse rifles'
breaking walls has been moved from a check in turf to a check in pulse
beams, and has been expanded to include structures, allowing them to
(slowly) break girders. For coders, it means that on_hit is a reliable
proc for the effect of a bullet's hitting an object.
Moved some unticked files into code/unused.
/code/datums/organs/pain.dm
/code/datums/diseases/alien_embryo.dm
/code/game/objects/effects/biomass_rift.dm
git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5604 316c924e-a436-60f5-8080-3fe189b3f50e
