* `Drawing_padding_top` and `Drawing_padding_bottom` affect spacing around
  drawings.

  * `Stroke_color`, `Current_stroke_color` for line drawings.
  * `Icon_color` affects the color of the little mode icon on the top right of
    a drawing.
  * `Current_name_background_color` manages the color when naming points using
    `ctrl+n`.
  * `Focus_stroke_color` affects the color of a point or line when you hover
    over it.
  * `Help_color` and `Help_background_color` affect the color of online help
    within line drawings.

Focus_stroke_color = {r=1, g=0, b=0}  -- what mouse is hovering over