Global switch between SI and Imperial for any given example?

[smiths]

Currently all of the examples are done in the SI unit system, but plenty of engineering and scientific work (especially in the States) is still done using the imperial system. Maybe we should have a global switch for each example that specifies the unit system. I'm not thinking anything about conversion. The switch just tells Drasil how to interpret the numbers in the sense of how to display the units. Everywhere that we currently display units in SI would be changed to display the equivalent imperial unit, if the imperial option was selected. It would still be up to the user to provide constants and inputs in the correct units. For instance, in the projectile example g is 9.81 m/s^2 in SI and 32.2 ft/s^2 in imperial. Changing from SI to the imperial option wouldn't modify the value of the constant g. The user would still have to make that change.

I feel like this would be a powerful example of what Drasil can do. Everywhere that we display units would be updated, just by switching one configuration parameter.