Experimental Welding Tool R&D

Changed the upgraded welders to include another origin tech
Changed the origin tech of experimental Welders
Changed the code for the experimental Welders to have a cooldown of a certain set time of currently 30 seconds until a unit of fuel refuels

Added the experimental welder to R&D designs list and moved other designs to be under a new section in the code so it makes more sense.
Replace the += with |=

OR solve welders removing and adding themselves to and from the processing
list,  because that's retarded. Just have an if(!on) return in process.
Op 12-aug.-2014 09:12 schreef "Aranclanos" <notifications@github.com>:

> In code/game/objects/items/weapons/tools.dm:
>
> >
> > +/obj/item/weapon/weldingtool/experimental/examine()
> > +	..()
> > +	usr << "The next charge time indicates it will be in [(max(countdown_wait - world.timeofday,0))]."
> > +/obj/item/weapon/weldingtool/experimental/New()
> > +	..()
> > +	processing_objects += src
>
> This object will be listed twice on the processing objects list when it's
> turned on, double process.
>
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> <https://github.com/tgstation/-tg-station/pull/4366/files#r16098521>.
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