Allows parameter access from QML among other things

Fly was way too small and Plan needed to be a tad bigger as well.

The dark css is the master and contains all style information. The
light css is the slave and only contains color information.

Conflicts:
	src/uas/QGCMAVLinkUASFactory.cc
	src/uas/QGCMAVLinkUASFactory.h

Also added a corresponding style for the light themes to make it a little prettier (though it wasn't broken on light themes).

There is a *bug in Qt5 (as of 5.3.1) where QMenuBar::items don't inherit their background colors, but revert to default system styling. The work around is to explicitly color their backgrounds.

flightgear hil: correct scaling of pressure for mavlink message and remove indicated airspeed from flightgear protocol, commit requires flightgear protocol update