Better font fallbacks

[romainmenke]

See :

• https://github.com/danielroe/fontaine
• https://github.com/TomerAberbach/postcss-fontpie

Issues :

• focussed on frameworks
• built on incorrect / under maintained packages
• not automatic enough
• discard unrelated descriptors
• ...

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What I want :

@font-face already contains all the needed information to create good fallbacks.

• analyse the linked src, check if it's serif, sans-serif, monospace,...
• preserve other descriptors, like unicode-range