Plans for the Qt client

[louis94]

There is QChart in qt 5.7,
It could be nice to get some charts at endgame in freeciv 3.0 maybe.
Like 2 comboboxes, first to choose column from endgame report, second for chart type.
Just under endgame table.

Also it would be nice to patch server to send scorelog at endgame.

I had a similar idea, but during the whole game, using data from the Demographics Report. I didn't investigate it, however.

Louis