Convenience layer with specific policy conventions

Rather than working on 'system' values (map with component values), it works
on 'app' values, which contain a system value (:makina/system), as well as
additional bookkeeping (:makina/state, :makina/config, etc).

This 'app value' is in turn wrapped in an atom, so we have an persistent
identity to operate on.

Kaocha plugin for `lambdaisland.makina.test`

Bind `*app*` to a started app value during tests. Relies on seeing a
`:makina/settings` in tests.edn, either at the top level, or on a test suite.
This location determines the scope of the binding. See the Makina README for
details.

Purely functional API for starting/stopping systems of components.

This is the Makina base layer, and is at your disposal when adapting it to
custom use cases. See the `app` namespace for more convenience.

Provide a system/app during testing