Pylint default

[Christian-B]

This pr and later similar (but independent) prs make pylint checking stricter and also more constant between repositories.

I have done my best to only do one type of change per commit so reviewing the commits may be easiest.

Changes include:
Using a global rcfile https://github.com/SpiNNakerManchester/SupportScripts/blob/master/actions/pylint/strict_rcfile
Rather than one per repository

A global spelling exceptions list https://github.com/SpiNNakerManchester/SupportScripts/blob/master/actions/pylint/default_dict.txt

A pylint.bash file to make it easier to run pylint manually/locally using as close as possible to the github actions settings.

To support the pylint.bash finding other repositories without requiring them to be in the path

• each repository (except utils) has a import_hooks.py file which adds paths to other repositories on a temporary basis.
• the strict_rcfile has an init-hook setting to import (therefor run) this code.
• this import assumes the file is local to the calling script so works with pylint_bash but try except passes in github actions.

Note: The changes to support scripts are already in master as impossible to test otherwise!

A number of spelling changes found by either github or running locally.

The code changes are limited to
-refactors some method or param names

• using f strings
• removing the keys() in for x in dict.keys() style
• import reordering
• adding overrides tags
• typing - and using cast
• replacing pattern for i in range(len(foo)):
• fixing slots to use square brackets
• removing or adding a FINAL decorator

Similar prs that can be done in any order:
SpiNNakerManchester/SpiNNMachine#236
SpiNNakerManchester/SpiNNMan#391
SpiNNakerManchester/PACMAN#541
SpiNNakerManchester/SpiNNFrontEndCommon#1157
SpiNNakerManchester/sPyNNaker#1437

tested by http://apollo.cs.man.ac.uk:8080/blue/organizations/jenkins/Integration%20Tests/detail/pylint_default/3/pipeline

[coveralls]

coverage: 88.271%. remained the same
when pulling f1d5cfa on pylint_default
into 3ee7bd0 on master.