Make flow and pressure test screens in setup

[rhotter]

What I had in mind was:

1. We'd walk the user through each test, perhaps with a helpful picture of what they have to do (for example, in the Flow test, they have to connect the tube to the ventilator).
2. We'd display some notion of progress while the test is running (the test takes 30 seconds).
3. We display the results of the tests.

Here is a doc that explains the pressure and flow tests in more detail.