jk/tex gyre heros

[jkrumbiegel]

This PR adds four fonts to Makie, TeX Gyre Heros Regular, Bold, Italic and Bold Italic. It also sets the default font to Heros Regular. TeX Gyre Heros is a free Arial / Helvetica lookalike.

These fonts are not exactly the originals from https://ctan.org/pkg/tex-gyre-heros but slightly modified with www.glyphrstudio.com. The issue with the original fonts was that they have an unusually high ascender which causes problems with vertical centering, default line heights and boundingbox sizes. Our current logic determines glyph boundingboxes from font descender to ascender. Therefore, characters are centered too low visually if the ascender is very large. Rather than overhaul the whole layout system to deal with these peculiarities, it seemed simpler to just create modified fonts that have less extreme descenders and ascenders. I set the descender to the small g extent and the ascender to the mirror of that above the cap height of M. That naturally centers the font correctly for numbers when centering with the boundingbox and generally looks good in legends as well.

Also I set the titles to bold font because that tends to be easier to parse visually in facet plots and in the future, subtitles should be optional and both title and subtitle in regular font looks bad.

[MakieBot]

Compile Times benchmark

Note, that these numbers may fluctuate on the CI servers, so take them with a grain of salt.

using time

master:  14.96 < 15.03 > 15.09, 0.05+-
pr:      14.96 < 15.06 > 15.17, 0.08+-
speedup: 0.99 < 1.00 > 1.01, 0.01+-
median:  +0.21% => invariant

This PR does not change the using time.

ttfp time

master   31.39 < 31.54 > 31.88, 0.16+-
pr       30.77 < 31.47 > 31.55, 0.27+-
speedup: 1.00 < 1.00 > 1.04, 0.01+-
median:  -0.24% => invariant

This PR does not change the ttfp time.