Fix for crash when removing item from QuickView, and addition of more generic signal/slot combonation for property updates

This commit still allows configuration widgets to be loaded from qgc files
assuming that there is no APM generated xml file (arduplane.pdef.xml) in
the files/%autopilorname%/ directory. This filename needs to be
configurable, and selectable at runtime. It is not yet.

The right click menu will only show up when connected to an APM autopilot,
since this feature is APM only.

This will be removed once APM updates to support MAVLink
parameters properly.

First stab at JSBSim interface, compiling, operational, but needs the correct startup folders and arguments

Implementation of 6DOF 3DMouse input (Windows only). Not tested yet.

transmit properly.