Enable the canvas font to be changed natively

[LimeSlime888]

Currently, the font of the OWoT canvas is unchangeable through the default GUI, which is not ideal, since users may prefer other fonts to the default Courier New.
Additionally, this font lacks in weight, making text harder to see, and limiting the amount of colour visible in coloured text artworks.

Using Courier New:

Using Liberation Mono, for example:

I had made a pull request in the past that perfectly incorporates this feature into a modal accessible through the menu, but @system2k seems to prefer something different:

I prefer it to be implemented a different way, but it requires creating a whole UI component first
the idea is to put it in a settings pane, but that doesn't exist yet

I haven't been briefed on how specifically to make this settings pane to FP's favour, so I can't work on this further until this is given / the previous implementation using a modal is deemed acceptable.