Standard apertures are circle, rect, oblong and polygon (regular polygonal shapes with 3 to 12 vertices)
The support of the standard aperture type polygon was missing in Gerber plotter.
The previous converter (maddy) is still available, during some time.
We therefore have the time to choose between them.
sundown is better to convert a md text, but is written to C
maddy has a few issues to convert a md text, but is written to C++
Both have no dependency.