Spcm

What's Changed
* Adding trg_timer method to DDSCommandQueue without unit conversion by spomjaksilp in https://github.com/SpectrumInstrumentation/spcm/pull/7
* Number of small bug fixes
* Added Gated and SpcmDeviceNotFound classes to the documentation
* Fixed unit conversion problems

New Contributors
* spomjaksilp made their first contribution in https://github.com/SpectrumInstrumentation/spcm/pull/7

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.5.1...v1.5.2

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.5.0...v1.5.1

Improvements:
- gated class iterator handling improved
- example gated recording
- FIFO multiple replay improved both example and class

What's Changed
* added a FIFO multi example
* added a gated triggering example
* fix for avail_modes by dhawals1939 in https://github.com/SpectrumInstrumentation/spcm/pull/6

New Contributors
* dhawals1939 made their first contribution in https://github.com/SpectrumInstrumentation/spcm/pull/6

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.4.6...v1.5.0

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.4.5...v1.4.6

Bug fix:
* Device identifier string not used correctly

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.4.4...v1.4.5

Improvements:
* opening a card without a context manager, using the open() method
* new exception DeviceNotFound
* improved checking of DDS features

Bug fixes:
* Multi class iterator gave the wrong array size in mode FIFO multi
* Card opening bug fix

**Full Changelog**: https://github.com/SpectrumInstrumentation/spcm/compare/v1.4.3...v1.4.4

New features
* Added extended features API method

Bug fixes
* Naming of card series and families
* Updated the required version of pint in the README