Create custom linter for SpaceAPI types

[dbrgn]

E.g. a contact object must contain at least one contact.

http://spaceapi.net/documentation

[dbrgn]

This ticket is still from back when we had a single codebase.

Now that this is a separate crate, it's probably very difficult to implement. Or do you know of a possibility to do this in crates that just use the spaceapi crate?

[rnestler]

We could do it with macros, so that you have to use the macros to create objects.

[dbrgn]

Ah, that's an interesting approach :) Or to allow both models: Create a spaceapi_validate!() macro that you can put around the constructor.