add readable application properties for barista to start using
A first pass through Barista trying to replace the current ad hoc system
with one with well-defined session/identities and a simple application
authorization model. The code compiles and somewhat runs at this state,
but cannot yet talk to Noctua, which will need further changes. No
attempt at communicating with Minerva yet.
Getting the environment ready for new configuration conventions (like
app.json).