Vehicle depot cannot get construction materials in a zone that lacks them

Issue description

It makes sense to have vehicle depots in remote zones, as larger equipment often can't travel through lots of areas, BUT in order for this to work, I think vehicle depots should pull resources from the 'construction zone' like buildings that are being built. Otherwise, you have to manually use unity for every single build, or else have a network of supplies being sent out just for transportation. That's a real pain, especially if you're doing mass upgrades or automatic replacements.

Reproduction steps

Behavior is constant

Game version and build number

v 0.7.5c (b455)

Operating system

Windows

I understand the motivation, but logistics zones are simple for a reason: to make them performant, easy to maintain, and easy to reason about. Adding exceptions like this adds more problems. Also, currently, the game does not recognize that the vehicle depot requires cargo for construction; that information is not even there. So I'm closing this as something we don't plan to work on.