The chanbackup plugin should update emergency.recover every time we
receive a new commitment secret.
Additionally, chanbackup should be able to serialize both the new
SCB format and the legacy format.
Key Changes:
- Added a commitment_revocation plugin hook to update emergency.recover whenever a new revocation secret is received.
- Implemented support for the new emergency.recover format while maintaining compatibility with the legacy format.
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).
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