Fix BSS handling in SWAP mode
Split swap features in several files
Reuse SWAP interface from SDK
Add a modal on Stax startup in SWAP mode
Return signing status to Exchange after a SWAP completion
Update dependencies
Reduce stack to build NanoS sr25519 version
Update snapshots
Closes https://github.com/Zondax/ledger-polkadot/pull/200
Update dependencies Reduce stack to build NanoS sr25519 version Update snapshots
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