Version 0.12.0

Version 0.12.0

Build:
- add conan support
- docker for clang-13.0.0

Doc:
- group obsolete NMEA sentences

General:
- update to clang-format-10
- consistent formatting

NMEA:
- interoperability of nmea::duration with std::chrono::duration
- minor cleanup of nmea::time_base
- remove obsolete function in test application
- sentence MTA added
- sentence VWE added
- sentence WDC added
- sentence WDR added
- sentence ZFI added
- sentence ZLZ added
- sentence ZPI added
- sentence ZTA added
- sentence ZTE added