Feature request: custom fonts

[Mikaela]

I like the experience of Harbour-books, but I think it could be even better if the user could change the font.

I would like to use OpenDyslexic, but I think an option to change the font in general would be good.

I don't know what this would involve, but as there is fc-cache command in SailfishOS Terminal, I think just having an option to change it from fonts installed on the system might work as the command looks for ~/.fonts and ~/.local/share/fonts judging by fc-cache -v.