Register bitcoincash: URI handler with OS

BIP-21: https://en.bitcoin.it/wiki/BIP_0021

aka set up deep links so that bitcoincash:asdfasdf addresses / invoice strings are clickable and then open to the Selene page /send/bitcoincash:asdfasdf

https://capacitorjs.com/docs/guides/deep-links

Edited May 20, 2023 by Jeremy

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