This now only makes it easier to test, but also more modular. It allows
us to use any kind of storage, not only the datastore.
Signed-off-by: Peter Neuroth <pet.v.ne@gmail.com>
Any file in this directory which is executable and whose name only
consists of alphanumeric characters, space, '.', '-' or '_' will be
automatically loaded when lightningd starts (unless suppressed with
commandline options).