Support color truetype fonts

[slime73]

Original report by Nathan 1852 (Bitbucket: Nathan1852, GitHub: Nathan1852).

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As discussed in irc, it would be very nice/usefull to add support for color truetype fonts.

Example font:
https://www.google.com/get/noto/#emoji-qaae-color

Example freetype implementation:
https://gist.github.com/jokertarot/7583938

[slime73]

Original comment by 4aiman (Bitbucket: 4aiman, GitHub: 4aiman).

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Is there an application that can open thins font? Windows' 7 font viewer refused to recognize this font.

FontForge too.
There are bitmap fonts, why not use those to store some emoji/symbols/icons?

[slime73]

Original comment by Alex Szpakowski (Bitbucket: slime73, GitHub: slime73).

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Apple's macOS font manager / viewer doesn't seem to recognize it either.

[slime73]

Original comment by Bart van Strien (Bitbucket: bartbes, GitHub: bartbes).

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Since the gnome font viewer doesn't support it either, I'm not sure how much use coloured truetype fonts get. I wouldn't mind supporting it if/when they become popular, but at the moment it seems like we'd be adding it for a single user.

Feel free to reopen when they are more common.

[slime73]

Original comment by Bart van Strien (Bitbucket: bartbes, GitHub: bartbes).

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Alternatively, since it does look kind of cool, patches are always welcome.