Feat/moderator responses in threads

[AndrzejBugdol]

Ticket

55

Summary

What does this PR do/solve?

Allows moderator to respond directly in thread, start a new thread under comment and update comment.

Test Plan

1. Add some comments
2. Start new threads by submitting new comments under created ones
3. Update your submitted comment, should only work if you are the author
4. Delete your comment, should only work if you are the author
5. Block thread and re-open it by submitting new comment

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (develop@15b9b57). Click here to learn what that means. The diff coverage is n/a.

@@            Coverage Diff             @@
##             develop     #150   +/-   ##
==========================================
  Coverage           ?   74.33%           
==========================================
  Files              ?       10           
  Lines              ?      643           
  Branches           ?      231           
==========================================
  Hits               ?      478           
  Misses             ?      162           
  Partials           ?        3           

Flag	Coverage Δ
unittest	74.33% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

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[hosnas]

When we can have this interesting feature?