Actor: implement "subtitles" setting for verbalconstants
DialogHandler: update the display of journal entry updates

as per BG2, but I think others will benifit from this too maybe.
TextArea: significantly bump the limit for MTA messages

50 was pathetically small, originally we had like a 100 line limit which is also horribly small. I dont know if there is supposed to be an option for this.
Dialog: make sure the old dialog is scrolled out before appending new

It looked funny to have dialog briefly visible before the scrollout took place