We do some fancy accounting for channel closures; since we're tagging
splice txs as closes we need to mark them as splices so we can treat them
as any other 'normal' on chain event.
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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