authentication via OAuth2.0?

Took a quick look at doing the authentication via OAuth2.0 instead of a personal token (Means a user can just click "authorize app" in the browser instead of having to create and store a private token and then manually load that into R). Unfortunately I've run into trouble; cannot tell how much of this is due to how httr is making the authentication request (https://github.com/hadley/httr/issues/167) or issues on Zenodo's end, but I've contacted both. Just putting this here as a placeholder meanwhile.

No repository files or tests are named. Start by reviewing the linked httr issue 167 and the existing authentication flow in the repository, then compare it with Zenodo's OAuth behavior. Done means browser authorization works without requiring users to create, store, and manually load a personal token into R.

Written by the indexing model from the issue text.