Add support for rendering basic HTML in TalkatuHistory.
Review Request #403 — Created Jan. 5, 2021 and submitted — Latest diff uploaded
* Remove the data argument from class methods * Renamed TalkatuHtmlParser to TalkatuHtmlRenderer * Created TalkatuHtmlPangoRenderer * Use the TalkatuMessage::content-type to determine how to render the text in TalkatuHistory.
Tested in the demo with a hack for the content type that will be fixed in a later review request.