[Feature Request] Location Markers with sequential number overlays

[moontango]

It would be interesting to somehow be able to indicate an "order-of-move" sequence among the location markers.

Use case: there are ten locations to visit in this area, and the "order-of-move" should be 1 to 10.

Perhaps:

1. Indicate the sequence number in a frontmatter parameter, e.g. "sequence:1"
2. Render a numerical "1" overlay, say, on top left (or right) of the location marker.
3. Wrap this overlay in a class so that users can easily modify colour, size, or even position.