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Modern ur:crypto-psbt standard support for QR codes. Experimental.
Close #89.
I had to write it from scratch as implementation from foundation devices uses too much memory.
Tested with small to mid-size transactions (up to 10 inputs) - works in most cases.
Sometimes it fails on large txs for mysterious reasons - decoder probably because of uart buffer overwrite, not sure why encoder fails. I need to investigate further.
Anyways, for most common txs it works, so makes sense to gather information when it fails and under what conditions.