Should be able to use lima without a QCoreApplication in main

Needed to avoid forcing people linking with LIMA to change their main.cpp

Thus, there will be no dependency to Qt at the source level.

Some possible tracks:
http://stackoverflow.com/questions/2150488/using-a-qt-based-dll-in-a-non-qt-application
http://stackoverflow.com/questions/14067431/signal-slot-connections-without-qapplication-or-qcoreapplication