this makes some services append-only, so the configuration
can look like:

modules = {
   cache = ‘’,
   hints = true,
}

without wiping previously-set modules

example:
modules.hints = ‘{“input”:”/etc/hosts”}’
.. is equal to ..
modules.load(‘hints’)
hints.config(‘{“input”:”/etc/hosts”}’)

The engine is responsible for central managemento of resources and work
distribution. This allows to spawn multiple loops.

The engine configuration / interface is based on Lua 5.1-5.2, including
a RPC and a simple CLI interface. This is going to be the core of configuration
later on.