Automate paying costs when there are no choices

[NBKelly]

Costs like:

• trash [x] cards from your hand when you have exactly x cards in hand
• Forfeit your only agenda automatically when you (choose to) rez archer
• other costs where there is zero possibility to make a choice (ie trash your only installed program with simulchip)

Could potentially be a setting if it's jarring.

I just think it would lead to a smoother game experience.