Spcm

What's Changed
* Implemented units and updated the examples
* Fix raising exception when libspcm is not installed on the system by ThibautLandrein in https://github.com/SpectrumInstrumentation/spcm/pull/3

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.0.6...v1.1.0

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.0.5...v1.0.6

* Feature: support for export to and import from file
* Bugfix: the number of samples in the buffer needs to be a multiple of notify size
* Bugfix: improved detection of 8-bit mode
* Future Feature: prepare for 12-bit packed mode
* Future Feature: added write to log register
* Documentation: documented DDSCore

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.0.4...v1.0.5

* Bugfix a problem with Jupyter notebooks trying to rerun the examples

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.0.3...v1.0.4

* Added DDSCore functionality
* Simplified setting maximum sample rate
* Improved README and removed unused requirements
* Added setting of the logging level
* Fixed transfer_length bug under Linux

* Improved READMEs
* Bugfixed Python 3.9+ support typing
* Added checking driver installed
* Added checking driver version
* Improved examples
* Bugfix automated documentation generation

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/commits/v1.0.2