RV - adding roof parts over edge boards and fix wheels pattern

Edges blocks have no roof parts, and this patch fixes it. As side effect, it will increase the weight of modified car, and I think it's good too, because atm they're too light. Also, now roof is the latest part in the list of installed parts in each cell (and it represents installation order: from bottom to top).

Additionally, wheels pattern was updated (put all wheels in one line).

I'll fix roofs of some other cars if it really make any sense.

BTW, can anyone say what's the purpose of these blueprints inside json?