Port of KeyCopier to the PortaPack Mayhem firmware (HackRF) — credit and a quick question

[osahv]

Hi zinongli,

Thank you for KeyCopier — it is a great little tool and the format table in particular is a lot of careful work.

I ported it to the PortaPack add-on for the HackRF running the Mayhem firmware,
which has a 240×320 colour screen that is large enough to lay a real key on. What I took from your project: the key
format table (generated from key_formats.c) and the contour algorithm. New in the port: UI/controls for the
PortaPack, life-size scaling for its screen, portrait and landscape modes (text and buttons rotate with the device),
and the build scripts.

Credit and licence: your MIT copyright notice and licence text are kept in the source files, in a NOTICE, and in a
copy of your LICENSE. The combined work is GPL-2.0-or-later because Mayhem is GPL. Your name and a link to this
repository appear in the README and the app source.

I tested it on a HackRF One R10 + PortaPack H2 with printed KW1 keys; the outline matches the real key well.

Two questions, if you have a moment:

1. Are you OK with this port, and with me proposing it to the Mayhem project as a pull request (credited to you as
   original author)? If you prefer a different wording for the attribution, tell me and I'll change it.
2. Is there anything in the format data you know to be off or want to be handled differently (for example depth numbering
   or the double-sided key logic)? I'm happy to contribute fixes back to your repository too.

Port repository: https://github.com/osahv/portapack-keycopier

Thanks again!
Andrey