Flamenwerfer flames are buggy

[UndeadZeratul]

Their collision boxes are huge, don't cause self burns, and don't burn corpses. Ideas are currently to reduce the projectiles themselves but add a secondary actor for splash damage, or on every tick run the blockthingsiterator to constantly deal splash damage to things within the original collision box.

The igniting corpses piece should just be a matter of calling A_Immolate() somewhere.

Basically, this thing should feel like a flamethrower, and currently it does not.