Dsmr-parser

- All objects can produce a json serialization of their state.

- All objects can now print their values
- Add parser + object for generic profile

- Add following missing elements to telegram specification v4:
- SHORT_POWER_FAILURE_COUNT,
- INSTANTANEOUS_CURRENT_L1,
- INSTANTANEOUS_CURRENT_L2,
- INSTANTANEOUS_CURRENT_L3
- Add missing tests + fix small test bugs
- Complete telegram object v4 parse test

- PyCRC replacement (`PR 48 <https://github.com/ndokter/dsmr_parser/pull/48>`_).

- Add a true telegram object (`PR 40 <https://github.com/ndokter/dsmr_parser/pull/40>`_).

- Add support for Belgian and Smarty meters (`PR 44 <https://github.com/ndokter/dsmr_parser/pull/44>`_).