Scripted examples

[james-trayford]

• Modify included examples in ".py" format, alongside `.ipynb` examples - tihs is intended for those using screen-readers while Jupyter is inaccessible
• Add the hear() method to the Sonification class, this plays directly to the soundcard so can play in the command-line.
• Add requirement for the sounddevice module to allow this access to soundcard - therefore requires reinstall or to pip install sounddevice inside strauss environment
• Added these as pre-merge tests, and update GitHub protocols to check for *.py files in tests

[james-trayford]

Is there anything else needed before merging this?

[SamYoules]

No, I don't think so.