[Feature Request] Toggle for applying civ bonuses onto unit cost

[HeavenlyChorus]

The in-game tech tree will display unit costs with civ bonus applied, when ur in a game playing as the civ.
For example, goths champions @39f+13g, portuguese crossbow-line @25W+36g.
That would be neat to have when players want to check the cost like they do in game, instead of calculating themselves.

[HSZemi]

That's a bit like #61 and a lot of work to implement properly.