Do not link to QtGui if it is not needed

Do not link to QtGui if it is not needed

ClientProxy: Fixed a segfault when cleaning up a client proxy that fa…

…iled to connect

Fixed all licenses

QtRpc: Added additional error checking on asyncronous returns in hope…

…s of fixing a rather odd crash

QtRpc2: Fixed a problem where our AvahiPoll implementation had a time…

…stamp wraparound breaking zeroconf

Fixed race condition crash when asyncronously connecting and disconne…

…cting rapidly in qtrpc2