Move conversation rendering to ConvModel.
clear messages model when removed from list
reduce complexity for loading buffer messages with store/restore, new notification logic
add linebreaks to window.focus handler
Fix time differences between client and server resulting in missing notifications for some messages (client would calculate these messages as already read)
Fix list online status not being updated with layContent()
Fix restore buffer not actually restoring
Fix convMore height in css
Merge branch 'convmodel'