Implement scenario settings

[henhuy]

Right now the user can select a scenario at the third menu step.
In my understanding, selecting a scenario will preset the controls for the next menu.

Regarding this approach, I have one question @nesnoj :
What happens if user selects a scenario and changes a slider in the next menu afterwards?
Does a new scenario "Custom settings" appear when going back to scenario menu?
Or are the sliders and switches are disabled if a predefined scenario is selected? (I think not, right?)

TODOS:

• prepare a folder containing config files for each scenario
• adapt controls from config file if user selects a scenario (maybe, a certain order has to be preserved, as slider ranges depend on detail settings)
• ? select "custom scenario" if user changes sliders/switches? (see question above)

[nesnoj]

I'll check this out next week