Icecoon weapon pack update

Removed some weapon, but made mod and 3 conversion kits.
Recipes now give new handloaded ammo.
Added ammo pulling.
Yeah, if you want an item removed, take it out of spawn lists first.  Then make a note in the item files saying that it's scheduled for removal, so people can take that into consideration.  (I'm planning on getting rid of pipe SMGs in similar fashion.)

I'm not sure why you're deleting these anyway--pipe SMGs defeat the design spec of not being able to craft gas-powered firearm actions, by comparison--but if you're gonna delete, give a window for folks with the items to die off or replace 'em.