General code quality

[MyreMylar]

General code quality and maintenance via tooling:

1. Sourcery recommendations
2. Pylint recommendations
3. flake8 recommendations
4. mypy recommendations
5. Ruff formatting
6. Update to latest pygame ce release
7. Remove Python 3.8 support

[codecov]

Codecov Report

Attention: Patch coverage is 92.03704% with 215 lines in your changes missing coverage. Please review.

Project coverage is 95.65%. Comparing base (09b051e) to head (005f27e).

Files with missing lines	Patch %	Lines
pygame_gui/core/text/text_box_layout.py	86.09%	42 Missing ⚠️
pygame_gui/core/utility.py	55.26%	34 Missing ⚠️
pygame_gui/core/layered_gui_group.py	79.23%	27 Missing ⚠️
pygame_gui/elements/ui_auto_resizing_container.py	50.98%	25 Missing ⚠️
pygame_gui/core/ui_appearance_theme.py	93.86%	16 Missing ⚠️
pygame_gui/core/text/html_parser.py	87.96%	13 Missing ⚠️
pygame_gui/core/text/text_box_layout_row.py	90.98%	11 Missing ⚠️
pygame_gui/core/colour_parser.py	81.81%	10 Missing ⚠️
pygame_gui/core/text/text_line_chunk.py	93.24%	10 Missing ⚠️
pygame_gui/core/drawable_shapes/drawable_shape.py	97.43%	4 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #672      +/-   ##
==========================================
- Coverage   95.77%   95.65%   -0.13%     
==========================================
  Files          90       91       +1     
  Lines       14105    14074      -31     
==========================================
- Hits        13509    13462      -47     
- Misses        596      612      +16     

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