gr: add support for user fonts

[jheinen]

No description provided.

[t-bltg]

Does GR have a font cache mechanism ?
gr_set_font is called a lot and GR.loadfont might be costly (I haven't checked) ?

[jheinen]

Yes, there is a font cache mechanism in GR. This MR only adds support for additional/other fonts in the user's or the system-wide font directories - GR.loadfont() is only called once in this case and the font dictionary is extended.

[codecov]

Codecov Report

Base: 90.43% // Head: 90.26% // Decreases project coverage by -0.18% ⚠️

Coverage data is based on head (875780d) compared to base (65cf8a1).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4671      +/-   ##
==========================================
- Coverage   90.43%   90.26%   -0.18%     
==========================================
  Files          40       40              
  Lines        8701     8702       +1     
==========================================
- Hits         7869     7855      -14     
- Misses        832      847      +15     

Impacted Files	Coverage Δ
src/backends/gr.jl	90.65% <50.00%> (-0.08%)	⬇️
src/examples.jl	96.03% <0.00%> (-3.18%)	⬇️
RecipesPipeline/src/series.jl	91.02% <0.00%> (-2.57%)	⬇️
RecipesPipeline/src/utils.jl	95.89% <0.00%> (-1.37%)	⬇️
src/components.jl	90.10% <0.00%> (-0.53%)	⬇️
src/backends.jl	82.08% <0.00%> (-0.50%)	⬇️
RecipesPipeline/src/RecipesPipeline.jl	100.00% <0.00%> (ø)

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[BeastyBlacksmith]

Do we need to bump compat or would this also work with GR v0.69.5?

[jheinen]

Do we need to bump compat or would this also work with GR v0.69.5?

No, the GR.loadfont function was already introduced in version 0.64.3.