Expose function to map API data to hovercard

If you get profile data from Gravatar it is returned in snake_case. However, the hovercard library expects camelCase. It would be nice if there was some way of either handling this natively, or providing a function to convert between the two.

Start by locating the hovercard library entry point that receives Gravatar profile data and the boundary where camelCase fields are expected. Compare that input with the snake_case Gravatar response and clarify whether native handling or an exposed conversion function is wanted; done means the chosen interface maps the data consistently and has coverage for the relevant profile fields.

Written by the indexing model from the issue text.