The main framework/inversion-of-control code for Biff.

Contains functions for starting/stopping Biff applications and for validating
data that needs to cross module/component boundaries.


GLOSSARY

system map:
  A map of namespaced keys that contains the state of the running Biff
  application.

modules:
  A collection of maps that together define your application's functionality.

components:
  A sequence of functions that start stateful resources and do other
  initialization needed by your application.