support rendering text

[da1nerd]

Here's a little tutorial. https://learnopengl.com/In-Practice/Text-Rendering

[da1nerd]

Rendering text sounds like it's going to be very complicate. I'm trying to make this a pure crystal project, but I could cheat and add bindings to c library that takes a font and renders it as textures.
Alternatively, we could just provide one simple font that's built in. This would be enough to get things working and then we could focus on custom font support later.