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Copyright (C) 2019 Robin Krahl <robin.krahl@ireas.org>
SPDX-License-Identifier: CC0-1.0
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- Add support for the currently unsupported commands:
    - `NK_fill_SD_card_with_random_data`
    - `NK_get_SD_usage_data`
    - `NK_get_progress_bar_value`
    - `NK_get_status` -- waiting for [libnitrokey issue 166][]
- Clear passwords from memory.
- Lock password safe in `PasswordSafe::drop()` (see [nitrokey-storage-firmware
  issue 65][]).
- Disable creation of multiple password safes at the same time.
- Check timing in Storage tests.
- Consider restructuring `device::StorageStatus`.

[libnitrokey issue 166]: https://github.com/Nitrokey/libnitrokey/issues/166
[nitrokey-storage-firmware issue 65]: https://github.com/Nitrokey/nitrokey-storage-firmware/issues/65