Similar to #8 for location types, except that this would be a brand new feature.

Questions

• Does order make sense for types, as it does for locations?
• Does adding a type to a list also include all children types?

Endpoints

• GET user/types/lists - Get user's type lists
• POST types/lists – Create a list
• PUT types/lists/{id} – Update a list
• DELETE types/lists/{id} – Delete a list
• POST types/{id}/lists/{id} – Add type to list
• DELETE types/{id}/lists/{id} – Remove type from list
• GET types/{id} – For authenticated users with lists, return membership in lists.