[INTERNAL|UI] add IRC style ChatDisplay

Added a composite that display the Chat using the good old IRC style.

This composite is not operational yet and will be integrated in further
patches.

Change-Id: I328b62d591aa592c3bd83525cfedf1766987b897
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1905
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>