* PNG's have their size in the name.
* The suffix has 2 chars:
  * type:
    * "s" for small, square
    * "w" for word, wide
    * "b" for below, big
    * "t" for text-only
  * coloring:
    * "d" for dark (to be used on a light bg)
    * "l" for light (to be used on a dark bg)
    * "g" for gray
    * "f" for filled (dark on a light circle)
    * "m" for maskable (dark on a white square)
