Add trezor package
Originally created by @stick on #17463 (Redmine)
As discussed in https://redmine.tails.boum.org/code/issues/17461:
Let’s add the “trezor” package to the distribution. This package is only 27 KiB and adds a command-line utility for managing Trezor devices. The required library “python3-trezor” is already included as the dependency of “electrum” package.
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