This is a big change that break compatiblity with existing applications
*and* with existing installed versions of main.py.

When upgrading it is import to update main.py:

    ./tools/wasptool --upload wasp/main.py

This is something of an experiment but now the app roll is traversed using
horizontal swipes and applications should primarily use vertical swipes
to navigate internally. This is mostly because if "feels" better but it
also leaves the vertical scrolling hardware available for use by the
app.

At this point we are starting to bring an event model for applications
but there's still a long way to go!

This is the first step in starting to formalize the seperation of
applications from the system manager.

Running garbage collection when idle it a waste of power...

At this point both the simulator and a PineTime will come up
and show a clock (although in the case of the PineTime the clock
will just come up at 12:00).