Parse doubly-encoded records

[coldacid]

See satoshisstream/satoshis.stream#22 and valcanobacon/BoostCLI#4 for background.

If the podcast custom record is still encoded after decoding, give it a second round of decoding so that apps which mistakenly double-encode the record will still work with Helipad.

[valcanobacon]

Fixed BoostCLI valcanobacon/BoostCLI@2c30eee

[daveajones]

I’d rather just reach out to the sending tool’s author and let them know to fix it as in this case. Trying to anticipate all the possible ways that an HTLC can contain miscoded information seems like a rough go.

[coldacid]

@daveajones well we're working on that already, per #27 (comment)