Refactor fonts from dict to classes

[andersonhc]

This PR is only refactoring the code touching fonts.
Instead of dictionaries, I created the classes TTFFont and CoreFont

This is a first step for the text shaping functionality

Checklist:

• The GitHub pipeline is OK (green),
  meaning that both pylint (static code analyzer) and black (code formatter) are happy with the changes of this PR.

• A unit test is covering the code added / modified by this PR

• This PR is ready to be merged

• In case of a new feature, docstrings have been added, with also some documentation in the docs/ folder

• A mention of the change is present in CHANGELOG.md

By submitting this pull request, I confirm that my contribution is made under the terms of the GNU LGPL 3.0 license.

[codecov]

Codecov Report

Patch coverage: 95.94% and project coverage change: +0.03 🎉

Comparison is base (567a4bd) 93.29% compared to head (47d1978) 93.33%.

❗ Current head 47d1978 differs from pull request most recent head c8acf05. Consider uploading reports for the commit c8acf05 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
+ Coverage   93.29%   93.33%   +0.03%     
==========================================
  Files          27       27              
  Lines        7355     7378      +23     
  Branches     1331     1329       -2     
==========================================
+ Hits         6862     6886      +24     
  Misses        309      309              
+ Partials      184      183       -1     

Impacted Files	Coverage Δ
fpdf/fonts.py	95.76% <94.38%> (-4.24%)	⬇️
fpdf/output.py	97.23% <96.87%> (+0.10%)	⬆️
fpdf/fpdf.py	92.62% <100.00%> (+0.07%)	⬆️
fpdf/line_break.py	99.20% <100.00%> (ø)
fpdf/table.py	92.48% <100.00%> (-0.07%)	⬇️

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[Lucas-C]

This is a really code refactoring!

Thank you @andersonhc 👍

I just had a couple of minor comments, but this PR is excellent.

I'm eager to merge it 😄

[andersonhc]

This is a really code refactoring!

Thank you @andersonhc 👍

I just had a couple of minor comments, but this PR is excellent.

I'm eager to merge it 😄

Thank you!

I'll start another PR soon migrating some functions to the font classes. It should be the last prep PR before text shaping.

[Lucas-C]

Merged!