FR: See total output for each stage

[Zvero01]

Maybe an easy one! I think it would be handy to see the total units per minute within each square/stage.

For example, if I need to route coal into several different components, it currently shows three outward routes of say, 30p/m, 45p/m and then 37.5p/m. The total is only show in the Items tab, but I think it would be good to also see this on the Visualise tab.

So each square has within it:

• The resource icon
• The nodes required (e.g. x 0.8)
• The building efficiency (100%)
• The total p/m output (112.5 p/m)