Remove remaining singletons

Start logging on heartbeat

View tweaks

Fix loading of meta data

Fix Joystick instantitation from settings

More works towards removing UAS completely

Fix the corner case of a system running on localhost using the networ…

Fix the corner case of a system running on localhost using the network and the loopback address in parallel. Force it onto the loopback interface.

Fix state of buttons (menu, toolbar)

Remove as many Singletons as possible

Empty APM Airframe vehicle component

Instead us a Toolbox concept which hangs off of QGCApplication

Turn off fatal warnings yet again

Scaling UI Elements

When you selected via the Menu to go to Fly Mode, the QML
toolbar didn't followed the option, and if you selected
via the menu to go to all the three possible views (setup,
fly and plan) the menu would be all-selected.

This tries to keep consistency of things.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

ParameterLoader to Vehicle, ParameterMetaData to FirmwarePlugin

Adding button to close PIP

travis-ci doxygen updates