Add turns to completion for each item on Production screen

[xarxziux]

Is your feature request related to a problem? Please describe. Below I've provided two screenshots of the production screens in the 2.6 client, and the Beta 7 client.

In the first, it shows a list of production targets, but also shows the turns until completion. Using this, I can estimate that the full worklist will take about 30 turns to complete. Obviously this is not an exact science and will likely change due to several factors, but it can still be a useful estimate.

In the second, I see the production values needed, but not turns until completion. In order to get an idea how long it will take to finish the full worklist, I will need to work this out manually, and I will need to do so again if I reassign the citizens in a way that changes their production output.

Describe the solution you'd like Simply having the turns until completion alongside the total value, the same way as it was done in 2.6, would be enough. Having an aggregated value of the total turns until completion would be an added bonus.

[alain-bkr]

+1