Add support for rendering basic HTML in TalkatuHistory.
* 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.
Testing Done:
Tested in the demo with a hack for the content type that will be fixed in a later review request.
Reviewed at https://reviews.imfreedom.org/r/403/
# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the talkatu package.