This requires us to rename "index" fields, rename fields if we have a
sub-object, and create sub-tables if we have an array, and handle the
fact that some listX commands don't contain array X (listsendpays
contains "payments").
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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).