wire up a dedicated debugging view with a time & date picker so that I can interactively debug the experience of moving through a typical day

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Right now I have to kind of imagine what it would be like to use the app and with so many scoring interactions it can be quite difficult to do this.

I want to have a debugging pane that can set up a scenario and then allow me to watch as the app sort of auto-plays the scenario so I can see what it looks like interactively.

This needs a few parameters:

• start time (time & date picker)
• end time (time & date picker)
• amount of real time to take (i.e. how fast do I want this to animate)

this should magic up a fresh Nexus on each try so that I don't need to worry about stale state. However I probably want a suite of canned intention objects available so I don't need to retype them all.

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To implement this in a sensible way I really need to implement #71 so that I can have a sensible, central interface that the debug view can talk to.