New features:
- Convert CSV file to FMU: 94 98 102
- Add tool to ease the deployment of dependencies by the end user: 95
- CLI uses now subcommands: `pythonfmu {build, buildcsv, deploy}` 103
- Support nested variables: 80
- Support logging message through the FMU logger: 86
- Support log categories (91). By default it is derived from the log message status. But you could define and use your own categories (see [pythonfmu/tests/test_fmi2slave.py::test_Fmi2Slave_customized_log_categories](https://github.com/NTNU-IHB/PythonFMU/blob/97335f4a93655136aec39149d89925b5f5423f37/pythonfmu/tests/test_fmi2slave.py#L129))
API changes:
- CLI use now subcommands: `pythonfmu {build, buildcsv, deploy}` 103
- `Fmi2Slave.get_value` and `Fmi2Slave.set_value` has been removed
- Customized `getter` and `setter` can be provided through keyword argument of `ScalarVariable` (see 80)