Android support

[srtucker22]

How should this get added to the tutorial?

Implementation at every substep would be really arduous, but we do want to end up with one codebase. I think the issue here is that it would make the tutorial code very long and might require additional explanation at every step.

Might make more sense to have an extra sub step at the end of each main step that applies any additional changes to support Android.

The best test here is to first see how many edits are needed if just updating code from the latest step.

[srtucker22]

note -- will be much easier after #19