Add createable Improvised Explosives!
Improvements on improvised explosives
They now have a random hidden detonation time that ranges from 3 to 8 seconds
They now can be made from any can, and will have a different appearance based on each one

-They look goofy if you try to spawn them in with admin commands (they have no soda can to reference, so the can is invisible in the sprite) but are completely functional otherwise

Modifies reagent_containers/food/drinks in order to move all canned drinks to the food/drinks/soda_cans to bunch them all up so they are easily worked into the IED

Modifies machinery/vending due to the abovementioned moving of canned drinks from food/drinks to food/drinks/soda_cans

Modifies the map because of the above to fix filepath issues

And of course adds weapons/grenades/ghettobomb.dm for the bulk of the IED, and modifies grenade.dmi for the sprites
removed redundant ..() from ghettobomb.dm
Adds a text message when a welding fuel tank has less than 30 fuel and you try to fill an iedcasing with it
No more -amount, cable coil is properly used up.
Ups the required fuel for improvised explosives to 50 units.
Moves the fuel remaining in the fuel tank check around
Merge pull request #1280 from Ergovisavi/improvexplosive

Adds createable Improvised Explosives!