Remove Poetry, Update Github Actions, Python and Libs

[sammcj]

Poetry seems to cause lots of problems with builds and makes building for ARM targets problematic (perhaps there is a workaround - but it was more effort than it was worth on my fork).

Changes:

• Swap out Poetry for standard setup.py and requirements.txt

Updates:

• Update Github Actions to current supported version.
• Update Python to current supported version.
• Update libraries to current supported versions.

Fixes:

• ARM (including Apple Silicon) builds now work. Apple Silicon / ARM builds #19
• Fix typos in documentation.

preprocess_cancellation_mac_arm.zip

[unixb0y]

100% this! We need this merge for Apple M1/2 support.

[spitfire]

@kageurufu can we have this merged, so that Mac builds can be reenabled and Apple Silicon support added?