Fill in the missing details on the domestic advisor screen

[TomWerner]

Here are the relevant TODOs:

• https://github.com/C7-Game/Prototype/blob/8b7643a1641ac43ca25ec0d6b1efc09df16c4d78/C7/UIElements/Advisors/DomesticAdvisor.cs#L162
• https://github.com/C7-Game/Prototype/blob/8b7643a1641ac43ca25ec0d6b1efc09df16c4d78/C7/UIElements/Advisors/DomesticAdvisor.cs#L284

We already track maintenance costs, and we can calculate the city-based revenue and tax collector revenue pretty easily from methods in City.cs.

We don't yet have interest (need to implement the wall street wonder, which might be an interesting building to implement, you can look at some other examples like marketplaces to see an example of a building with custom logic), and don't yet have multi-turn civ-to-civ trade deals, so those can be ignored for now.