Repair everything button

**Issue by [vttale](https://github.com/vttale)**
_Thursday Dec 29, 2016 at 05:35 GMT_
_Originally opened as https://github.com/CQUI-Org/cqui/issues/197_

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It's a bit annoying that when a district gets pillaged you can't just say "repair everything", because (for example) the Power Plant depends on a functional Factory depends on a functional Workshop. Just one click should do it all. Is this possible in a mod?

Start by researching the modding APIs and existing repair controls for pillaged districts in Civilization VI. Determine whether a mod can trigger repairs in dependency order, then define the one-click behavior and verify that all dependent buildings are repaired without requiring separate clicks.

Written by the indexing model from the issue text.