Trezor: implement "seedless" mode #5118
Merged
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Newer Trezor firmwares introduced a "seedless" mode.
This is an option during device initialisation. When enabled, the user will never be shown the seed words, and the device even stores this fact; i.e. the user will have "proof" the mnemonic was never shown. Apparently the main use case in mind is redundant multisig setups.
There are now multiple "advanced" options when initialising a Trezor, so I hid some of them behind an "expert" button.
Also did some clean-up.
default screen
in case of previously selecting `Let the device generate a completely new seed randomly`, after revealing expert settings
in case of previously selecting `Recover from a seed you have previously written down`, after revealing expert settings (when using Trezor One)