wacom: highlight the currently active stylus
When a stylus is in proximity, highlight the currently active stylus.
Closes #2464 (closed)
Notes:
- I couldn't figure out how to recolour SVGs, so this includes a duplicate set of svgs (
"wacom-stylus-highlighted.svg"
and friends) that only have thefill:
changed to the palette color. - The little dot next to the name in the mockup is missing, not sure how do do that one.
- I kept the timeout patch separate so it's easier to drop if we don't want it, happy to squash together.