Comments flat mode

[amass01]

This PR adds comments flat display mode, as described in #1209 - in order to make it easier for users to read all new comments without the struggle caused by the comments nested/tree structure.

Closes #1209

[amass01]

@tiagoalvesdulce Addressed

[tiagoalvesdulce]

Looking pretty good. But some sorting options are unresponsive. Can you take a look? Here it works just fine after a refresh but until a refresh is made the sort is messed up. See:

"comentario c" should be on top of "comentario d".

[amass01]

@tiagoalvesdulce Nice catch, I could reproduce it - the issue was that the sort/rank of comments wasn't updated on comment like event.
I've dispatched a sort action on like events, which should handle the case properly.

[tiagoalvesdulce]

IMO the "re-sorting" on comment like isn't looking good. It's weird to vote on a comment and see it jumping to another place. Can you remove the dispatch in the handleCommentLike handler and keep it in the handleCommentsModeToggle handler?

[amass01]

@tiagoalvesdulce agree, it's bad UX, changing it.