Refactor ScreenshotGenerator

Major rework of the ScreenshotGenerator test, replace monolithic single test function with separate functions that capture related screenshots. This allows for portions of the test to be commented out for testing purposes.

Also adds a few additional screenshot captures that were missing in the initial implementation.

Finally, it renames all the screenshots to be more logical, and to make them more closely match where they are used in the use manual, which is the main purpose for these screenshots to exist.

@sphalt2 take a look at this and give the test a run to make sure it works for you as well.

Note that the screenshots I've included were taken with an Android 14 Pixel 2 emulator.