v2.0.0

Makes a request the only way to call a getter.

Breaking

• get_interest(const interest_request&) and get_interest(request, seed); get_interest({}) for a random country, unknown age and sex, three hobbies and two genres per medium.
• The country-only, seed-only and no-argument overloads and instance seed()/unseed() are removed. Data loading and layers stay on the instance.

See the documentation for the request type and examples.