This move changes the Env trait: It removes all functionality that is
used only in vendor commands (`FirmwareProtection`, `UpgradeStorage`)
and adds a function to call when parsing CBOR commands.
The abstraction necessary to test these commands is instead realized
through compile flags. The mock upgrade storage is active when compiled
for std for example.
* Replaces the Rng256 with RngCore from rand_core
The old trait was designed with our software crypto in mind. We should
use a more standard API going forward.
- Removes libraries/rng256/
- Ports libraries/crypto/ to rand_core
- Moves the used RNG trait to api/
* Use StdRng directy in TestEnv
