Support different fonts for glyph and it's ruby text

[edouard-lopez]

When working with Noto font, one issue is due to the fact a font file is limited to one script. For instance, NotoSansTifinagh-Regular.ttf only contains the Tifinagh's glyphs but not the ASCII.

So the generated font show tofu box instead of the pronunciation (as seen below):

Idea

We should be able to open multiple font in order to be able to create give and pronunciation with different script (e.g. Tifinagh with latin or Arabic, Hanzi with Pinyin or Juyin, etc.)

Note: this is another reason to try fontkit

[hugolpz]

Use different fonts for the sign and the annotation.

[edouard-lopez]

That's the idea, but I need to implement it.