profile: move the "Follow you" badge into the profile header (Grimless)

Properly implement top-level tests and fix one test using the wrong Block conversion property (Grimless)

Create helper extensions for Block and update tests for the Block helper model (Grimless)

Move the Block helper type to its own file, collapse the various standalone functions for parsing block data, and refactor consumers to initialize a Block with given data and access its members as needed. (Grimless)

test: pass keypair instead of privkey for test cases (Jon Marrs)

pushed to damus:refs/heads/master

http://git.jb55.com/damus/commit/b18a0c573e9dc42bb424157812209e153927758b.html