Feat/app state

[ajb85]

Description

** INCOMPLETE **
Adds state so the app can remember a command while going on a detour (like onboarding). Requires some specific patterns to work.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Change status

• Complete, tested, ready to review and merge
• Complete, but not tested (may need new tests)
• Incomplete/work-in-progress, PR is for discussion/feedback

How Has This Been Tested?

Ran through locally, not completed as facebook is no longer sending postbacks.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My code has been reviewed by at least one peer
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• There are no merge conflicts