MessageFormatter: add default argument values for convenience
ZncManager: update for "znc.in/playback"
Fix MessageFormatter::formatLine()
Fix MessageFormatter::formatContent()

Do not format nicks within links
Fix ZncManager::requestPlayback() to respect znc.in/playback capability
Buffer-based MessageHandler
Fix "repeat" handling
Fix "repeat" handling - take 2
Use IrcMessage::isOwn()
Merge branch 'master' into sailfish

Conflicts:
	messageformatter.cpp