Adds createable Improvised Explosives!

Recipe:
-Use an igniter on any soda can
-Use the assembly on a welding fuel tank to fill it up
-Add wiring
-This creates an improvised explosive

-Improvised explosives are (-1,0,2) sized explosions, just like a fuel tank
-The timer is anywhere from 3-8 seconds, and you cannot examine it to figure out what it is
-Igniters are actually more rare than you think if you believe that this will cause everyone to have ten trillion grenades on the station at all times