wacom: Add AES styli as separate stylus SVG

These are styli like the Dell Active Pen and most of the styli supplied with laptops with built-in tablets. We don't always know how many buttons these have so the SVG has just one large button. They're typicall slimmer and less rounded than the Wacom pens so let's reflect this here too.

This requires libwacom 1.4 released June 2020

cc @Doomsdayrs - can you give this a try please?

Related #2937 (closed)