As per latest spec revision.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-EXPERIMENTAL: BOLT12 offers can now be unsigned, for really short QR codes.
1. listpeers has a deprecated `"closer": null`, which we need
to handle in the schema, while trying not to damage our
documentation too much.
2. Don't print a condition if there are no fields to print.
3. Allow a special "untyped" marker for multifundchannel which returns
arbitrary JSON in a field.
4. Allow a single field return (for 'stop').
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We used to only set it for single-use offers (where it's required),
but it's still interesting for multi-use offers, so let's keep it
there.
We also put this field in the documentation.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
