framebuf: Support drawing text at different sizes

[jonathanhogg]

I'm increasingly making little widgets with MicroPython that use small OLED displays to present information to the user. The text support in FrameBuffer() is great, but it's limited to the built-in 8-pixel-square font. Being able to display text at different sizes makes a massive usability difference.

I've already written a patch that does simple arbitrary scaling of the built-in font and raised PR #6263. I've been using this in production devices for a year now, but supporting a bunch of patches is becoming a bore and I hate not being able to use the official releases so I'd like to get this PR mainlined as-is or some feedback on what I could change to get it accepted.

Thought that perhaps opening an issue might raise the visibility of this.

[CoreProduction]

We'd love this too - it's a big deal for accessibility. Members of our forum have expressed interest in text scaling too! (thread)