Add a prepper house with a gunsmithing garage (CR)

I'm thinking we need more interesting trapped houses, so I made one. It's got a trapped front living room, and fortified backend, with a good amount of gunsmithing loot in the garage, and some canned goods on shelves. Opinions on the balance and such? I think I may make a "carpet landmine" trap to replace the blatant ones right now, but I couldn't find the location of the location of identstring to make a new trap.

Edit: oh, and I bumped up spawns in prepper basements (which was originally intended when I first did that, but I messed up the spawn syntax) and moved the gunsmithing itemgroups to the generic itemgroups.json for use in this house as well.