Refactored code to make file easier to read, understand, and maintain

[JacobOSU]

Split cursor class into subclasses
Changed code to use subclasses
Removed deletion of methods
Changed variable names to use snakecase
Changed variable names to be more descriptive
Refactored load_xbm function to rid of duplicate code

[Shidoengie]

The subclass split was rather unecesserary and imo bad, everything else is alright

[illume]

Hello. Thanks for this, it's a good idea.

Looks like there are some test failures though.

Do you want to continue this? If so, it would be best to make a change and commit to smaller parts. Perhaps only change and commit one function at a time and push. That way the tests should run each time.

We now use the pre-commit tool for running code formatters/linters/etc.

python3 -m pip install pre-commit black ruff pylint
pre-commit run -a

To run the tests for cursor...

python3 -m pip install .
python3 test/cursors_test.py