Feature/non-se-members

[skaramicke]

Things I feel should be refactored separately, or perhaps changed at some point:

• Perhaps rename URL_EVENTS_API to something like URL_REST_API since it's used for multiple things, or add a copy of the value called URL_NON_MEMBER_API, or just leave it.
• We could grab the firstName, lastName and contact_info, so that data is already there for users who manage to log in before we add privacy stuff to non members and let them access the rest of the app. That data is currently only stored when isMember is true, and only upon creation.

Note: This PR also fixes the refresh_token endpoint throwing input validation errors.

[skaramicke]

Screenshots obtained by temporarily setting user["isMember"] = False in authm

Member login form	Non member login form

Tab bar contents	Settings form

[Imamyable]

I actually like URL_EVENTS_API, since we call the hosting site "eventsiten".

[skaramicke]

Member login form	Non member login form