COLDCARD Q v0.0.6 beta

- bugfix: randomize keys for PIN entry

- when picking files, we just skip to showing you the files options (or picking the

single winner) rather than talking about it first.

- BIP-39 passphrase process completely streamlined

- batch signing now offered when we see two or more signable PSBT's on the card

- bugfix: can now reformat SD card in B slot

- move away from `44'` (prime) for hardened derivation paths, in favour of `44h`; both accepted

for input, but we are going to display `44h` style going forward.

- bugfix: (QR) or other double-wide chars would be garbled if half off right edge

- cleanups, bugfixes