Support showing earning columns in the project list

[tanius]

Not sure if this is relevant enough to be implemented, but right now I'd wish there would be these settings (given by the menu entries they would have):

• Settings → Projects → Show column "Earnings today"
• Settings → Projects → Show column "Earnings yesterday"
• Settings → Projects → Show column "Earnings this month"
• Settings → Projects → Show column "Earnings total"

and probably also for the remaining values for which time statistics columns are available ("This week", "This year"), even though that would be a lot of settings.

Reason: I think seeing the money trickle in can be a good tool for motivation when working on bullshit projects. 🤣