The new access APIs are more symmetrical:
1. edit_utxo_description -> add_utxo_description
2. add_payment_hash_desc -> add_payment_hash_description
And to read it, instead of accessing ->ev_desc (now removed) we use
chain_event_description() & channel_event_description(), threading bkpr though
as needed.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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