Folder structure cleanup, added APM tooltips

...ltips/MAV_AUTOPILOT_ARDUPILOTMEGA-MAV_TYPE_FIXED_WING.txt

...er_tooltips/MAV_AUTOPILOT_PIXHAWK-MAV_TYPE_FIXED_WING.txt

...ter_tooltips/MAV_AUTOPILOT_PIXHAWK-MAV_TYPE_QUADROTOR.txt

files/vehicles/Ascent_Park_Glider/ascent-park-glider.skp

files/vehicles/Multiplex_EasyGlider/multiplex-easyglider.skp

files/vehicles/Multiplex_TwinStar/multiplex-twinstar.skp

...s/vehicles/Walkera_4G6_Coaxial_Helicopter/walkera-4g6.skp

models/cessna.osg

src/comm/MAVLinkSimulationLink.cc

src/comm/MAVLinkSimulationMAV.cc

src/uas/QGCUASParamManager.h

src/uas/UAS.cc

src/uas/UAS.h

src/uas/UASInterface.h

src/ui/QGCParamWidget.cc

src/ui/QGCParamWidget.h

src/ui/uas/UASControlWidget.cc