Automatic design upgrades

**What do you want to see?**
All designs that can be upgraded should be upgraded automatically to temporary designs that are shown subordinate to the "real" designs. If you build a temporary design, it becomes real. Otherwise it continues accruing upgrades without changing its iteration number until you do so.

**How would it help players?**
Less clicking to upgrade designs

**Alternatives**
N/A

**Screenshots and mockups**
N/A

**Things to consider**
Should the temporary designs be shown below or next to the corresponding real designs? Or should they be segregated off on their own somewhere, like another tab or panel?

How will this interact with iteration numbers and the design library?