Redo of mounted forge, now portable smithy

I noticed a lot of people didn't really like not having any storage in the mounted forge, so I redesigned it to be more similar to the other vehicle crafting stations.  Now you have a crafting recipe to build a "portable smithy", as opposed to just attaching the electric forge straight to the vehicle.  This also gives the smithy storage space, as the crafting recipe requires a steel frame (to build the storage part).

Tested and works, although there seems to be a problem in master right now that prevents tools/components stored in containers from being used in crafting.  I made a separate issue for that, as it affects ALL containers, not just this.