[draft] Good support for NewComputerModern font

[Kolaru]

Reintroduce support for NewComputerModern which as better support for unicode and should have all glyphs we'll ever need.

Should help with #44, #46, #49 and #57.

Require the awesome work of @jkrumbiegel in JuliaGraphics/FreeTypeAbstraction.jl#72 and MakieOrg/Makie.jl#2139

Require some work to avoid reintroducing #26

[codecov-commenter]

Codecov Report

Merging #67 (aa2c7ff) into master (ca57d2b) will decrease coverage by 3.38%.
The diff coverage is 96.77%.

@@            Coverage Diff             @@
##           master      #67      +/-   ##
==========================================
- Coverage   81.88%   78.50%   -3.39%     
==========================================
  Files           9        7       -2     
  Lines         508      442      -66     
==========================================
- Hits          416      347      -69     
- Misses         92       95       +3     

Impacted Files	Coverage Δ
src/engine/texelements.jl	80.26% <93.75%> (+3.04%)	⬆️
src/engine/fonts.jl	80.00% <100.00%> (+1.05%)	⬆️
src/engine/layout.jl	89.68% <100.00%> (-2.11%)	⬇️
src/parser/commands_registration.jl	34.78% <0.00%> (-49.73%)	⬇️
src/parser/parser.jl	72.60% <0.00%> (-0.19%)	⬇️
src/MathTeXEngine.jl
src/engine/computer_modern_data.jl

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[Kolaru]

@jkrumbiegel Everything should be okay, but I didn't manage to run Makie tests with your PR and this one (everytime I forgot or to do it properly x_x). If everything looks fine to you, I'll merge and tag a new version.

[jkrumbiegel]

Here's a couple refimages. I think it looks mostly good but the x^2 has the 2 very tight on the x now.

Recorded:

Reference:

Recorded:

Reference:

[Kolaru]

Thanks a lot for the feedback and the reference image @jkrumbiegel

Merging now.