[Feature] Add support for https://www.openaip.net/ vector layers

[starnutoditopo]

I'd like to use this application for my flights on ultralight aircrafts. It would be nice to have the capability to add layers displaying air spaces (and other information) from https://www.openaip.net/ .

OpenAIP also provides bitmap tile layers, but the vectorial features would be preferable.

[pfbreton-perso]

seems related to #298

[vcoppe]

I have investigated a bit on this, and unfortunately the vector features shown on the map are not available as a vector basemap. They actually request all the geometries through their API and then create a GeoJSON layer out of it. This would be too much code for a single layer. I have created an account and tried to add the raster version documented here but it does not work. Let me know if you manage to make something work.