Wrap freetype.Font to make replacement easier

[MyreMylar]

Replacing the freetype.Font submodule is tricky as it contains several subtle features the Pygame GUI makes use of (like adjustment of underlining for example).

This PR should make the process easier by wrapping up the parts of freetype.Font that the project uses so it is clearer what needs replacing and emulating for a swap to pygame.Font.

[codecov]

Codecov Report

Patch coverage: 93.86% and project coverage change: +0.08 🎉

Comparison is base (7c706c1) 97.55% compared to head (03dd71c) 97.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #418      +/-   ##
==========================================
+ Coverage   97.55%   97.63%   +0.08%     
==========================================
  Files          81       83       +2     
  Lines       11215    11271      +56     
==========================================
+ Hits        10941    11005      +64     
+ Misses        274      266       -8     

Impacted Files	Coverage Δ
pygame_gui/core/text/html_parser.py	92.54% <ø> (-0.03%)	⬇️
pygame_gui/elements/ui_text_box.py	99.44% <ø> (ø)
pygame_gui/core/text/text_box_layout_row.py	90.55% <60.00%> (+1.82%)	⬆️
pygame_gui/core/utility.py	95.22% <88.88%> (+2.75%)	⬆️
pygame_gui/core/gui_font_freetype.py	89.39% <89.39%> (ø)
pygame_gui/core/interfaces/__init__.py	100.00% <100.00%> (ø)
..._gui/core/interfaces/appearance_theme_interface.py	100.00% <100.00%> (ø)
...e_gui/core/interfaces/font_dictionary_interface.py	100.00% <100.00%> (ø)
pygame_gui/core/interfaces/gui_font_interface.py	100.00% <100.00%> (ø)
pygame_gui/core/text/hyperlink_text_chunk.py	100.00% <100.00%> (ø)
... and 4 more

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