Initial QT Awareness.

* Will check for Q_PROPERTY fields and remove them from the unused
function list
* Will parse the .qml files (if they're in the source list of files to
check) and remove references to C/C++ functions which would have
otherwise been unused.

Use --enable=all or --enable=qt etc to enable the functionality and add
the *.qml (i.e. src/assets) path to the command line interface
invocation.