Merge draw.rs in drawing_ctx.rs
I am not 100% sure this is the direction you want to go, since I heard you say that long term you would like to get rid of draw_ctx altogether.
However as it stands now most of the stuff in draw.rs are pretty much draw ctx methods and having them in a different file does not make them any less coupled.
If we want to move toward a model where each element knows how to draw itself I guess we could move draw_surface in image.rs and the pango stuff in text.rs, even if it does not feel 100% right