A few bug fixes:

- Dont make webfinger request when viewing community/user profile (fixes #1896) (#2049)
- Case-insensitive username at login (#2010)
- Put community last in webfinger response (fixes #2037) (#2047)
- Dont check for ban in MarkCommentAsRead (fixes #2045) (#2054)
- Empty post bodies (#2050)
- Add tombstone tests, better test errors (#2046)
- Accept single object as to for arrays too (#2048)
- Cleaning optional post bodies. Fixes #2039 (#2043)
- Fixing liking comment on blocked person. Fixes #2033 (#2042)
- Add tests for lotide federation, make lotide groups fetchable (#2035)
- Remove unneeded dependency on activitystreams (#2034)
- Fixing private instance check. Fixes #2064 (#2065)