Support for Debrief shapes/annotations

[IanMayo]

We currently only export Tracks to GeoPDF.

The exported GeoPDFs could convey more information if they included filled/outline shapes such as Circles, Rectangles, Polygons, Lines, and labelled points.

Further, some of these may have start/finish times if they are only valid for a limited period.

This task doesn't relate to Debrief, it's just about putting instances of the above objects into the test dataset (and G-Drive documentation).