[feature] Import / export gps path for drones

[s-leger]

Hi,
Currently working to implement io for gps based path to setup (dji phantom like) drones fly path (kml, kmz) right in blender.

Got a rougth implementation reading kmz (path only) from earth and kml export still needing some love (especially altitude as relative ones instead of absolutes - we do have to make some more tests).

The export has proven to be a pretty good basis to setup fly, and tracked movie resulting path show a realy small derivation in xy coords of 0.3m only (with a constant 3m +- 0.5 on z axis mostly due to setup error). So it's working like a charm.

[stuarta0]

Hi s-leger - do you have code that you can share? Send through a pull request and hopefully domlysz will merge it. It'd be great to have this as a feature for everyone.

[s-leger]

Still pretty rougth import / export, with limited kml/kmz feature support (only a single path from a mesh)
I'll take a look at a pull request for it.