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.
* removes read_partition and partition_length from upgrade API
* renames partition to bundle, also data type change from slice to Vec
* removes hash from Env API
* fixes comment
