Interaction Application Switching

[alistairjevans]

We need to be able to switch 'application' during a test, so we can maintain two different interaction behaviours at the same time.

I imagine that this will require:

• An application marker in each file (like a namespace).

# general button rule
Component: button

Application: app-id

# specific to the app-id application.
Component: button 

• Multiple built interaction sets by the project compiler.
• A built-in step that allows a test to change application.
• Contextual linking that understands that the interaction set has changed and a different one should be used.