Conan: leaf module recipes should check against changed module features

Each leaf module recipe needs to declare its own (optional) options that match to the configuration options.

As it is easy to forget to update these add a sanity check in the recipes.
An approach could be:

1. calculate a checksum from configure.cmake
2. embed the checksum in the recipe
3. when "conan export" is being run compare the hard coded checksum against the current configure.cmake
4. if the checksums differ raise an error