feature: program firmware protocol #34
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Adds the `FirmwareHeader` type to represent the header block in an ITL firmware file. The header block contains information about the rest of the firmware file, including the magic bytes, RAM block size, and firmware file code.
Adds the `FirmwareRam` type to represent the RAM block in an ITL firmware file. The RAM block contains code executed on the machine during the firmware update process.
Adds the `FirmwareData` type to represent the dataset block in an ITL firmware file. The dataset block contains currency set information, and other data needed to run the validator device.
Adds the `parse_firmware_file` helper function to parse `FirmwareHeader`, `FirmwareRam`, and `FirmwareData` structures from an ITL firmware file.
Adds the `ProgramFirmwareCommand` and `ProgramFirmwareResponse` messages for use programming unit firmware.
Uses conditional compilation to not create a `rng` variable when in `test` mode. Clears compiler warnings about unused variable.
Adds the `FirmwareHeaderCommand` and `FirmwareHeaderResponse` messages for sending the ITL firmware file header to the validator unit.
Cleans up some code, and adds a formatter implementation for `FirmwareHeader`.
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Adds types necessary for implementing the program firmware protocol over SSP.
Adds a helper function for parsing ITL firmware files into
FirmwareHeader,FirmwareRam, andFirmwareDatatypes that represent the header, RAM, and dataset blocks respectively.