Lemmy v0.15.2 Release

        - 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)