Calculate Production/Consumption stats over choosable time span

[Benedikt Straub]

From the forum: https://wl.widelands.org/forum/topic/4328

in the global stats, productions and consumptions for a resource goes up and then down again after a time. So it represent the instant production/consumption. However, IMHO, the total produced and the total consumed of each resources since the begin of the game would have one big advantage […]

Maybe a logarithmic slider + input field which select the time window over which the integration is carried out, where the smallest time window is the current setting and the biggest time window infinite

[GunChleoc (gunchleoc)]

Migrated to https://github.com/widelands/widelands/issues/2114