Use autocxx to create ffi interface

[Murmele]

User Story

Currently the ffi interface is quite limited to the map renderer. So when using a custom renderer observer this must be implemented in the bridge manually as far as I understood.
When using autocxx this would be generated automatically and all functionality from maplibre is automatically available.

Is there any reason not doing it?

[CommanderStorm]

We investigated this a bit as part of the following PR

• FFI Design Proposal maplibre-native#1254

We never got this fully working though, while for cxx we got the current MVP version working.

Because of the cxx work, we are now in a much better place. If you want to try doing this again, that would likely not be as painfull as previously.

We now have amalgam builds, working header archives and such.

[nyurik]

do note that autocxx is somewhat dead (according to me speaking with the google team at a conference). It was a single person project, and that person is no longer maintaining it. Google now has a big team dedicated to this, but they are still in an experimantation stage, and they chose a different route. CXX at this point is the most stable solution

[Murmele]

Thanks for clarification. Currently I am extending this cxx bridge to support also the observers and the continuous mode. When I am ready with it I will make a pullrequest then