Added:
- Error messages for BSMP return errors (0xE_)
Changed:
- `set_slave_add` is now a property, `slave_addr`
- `EthDRS`, `GenericDRS` and `SerialDRS` can be imported from the base module
- Fixed BSMP errors appearing as checksum errors
- Fixed eth-bridge version compatibility troubles (such as including the response status byte in the checksum)