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Link venmo #1857
This PR adds Venmo as a linkable account (but not an auth-able one). This is the first step towards several possible new features powered by Venmo (using Venmo as a funding source for recurring tips, using Venmo for paying out developers, and possibly using Venmo as a solution for #5).
This PR also does stopgap refactoring of several parts of elsewhere:
(sorry about the gross extraneous merge commits, we can rebase this a bit if y'all want)