This commit changes the ChatWindow/ChatView APIs to not pass highlights actions as additional parameters but instead they are now part of the ChatWindow::ChatMessage and its parts. This allows the controllers to do highlighting in one single place and play sound actions on the highlighted message in a single place. On a highlighted message only unique sounds are played and they are played in sequence of the rules that matched the message. Test-Information: Adjusted the existing unit tests accordingly. Added unit tests that check reduplication of highlight action sounds and that the sound actions are emitted correctly. Manually verified that highlight sound actions with and without duplicated sounds are audible on OS X 10.11.3. Change-Id: I68c88e0d285d79d87b2997ed29d92b140480b394