[KTp/Declarative/MessagesModel] Implemented message sort by sent timestamp
Review Request #128954 - Created Sept. 20, 2016 and submitted
Implemented message sort by sent timestamp (if available).
This fixes order of scrollback messages.
Works, fixes the issue.
|I'd remove the comment, I'd say it's obvious that this needs to be iterated backwards.||Aleix Pol Gonzalez|