Unfortunately, this is awkward: we just copy through most requests,
so we can't easily add a "deprecation" field to each one. So we do
a notification if the next command has a different deprecation status
than the global one, but that requires opt-in from the plugin.
We didn't previously document the subscriptions array, so do that now.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: Plugins: `deprecated_oneshot` notifiction subscription to change deprecated status for a single command.
The data-format changed in 2019.
The field `amount_msat` was renamed to `msat`
(See 2907e430d5)
The data-format changed again in november 2023.
The content of the field `amount_msat` was changed.
It was a string `"1000msat"` and became a number `1000`.
(See 0b23133ab2)
The current documentation still mentions the data-format before
2907e430d5.
I've updated the docs to reflect the latest changes.
I've also incluced a short mention of 0b23133ab2 to help help
developers create plugins that work both pre 23.11 and post 23.11.