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

- fixes #1882

Debug window to help define device sizing issues.

Disable MissionManagerTest and MavlinkLogTest

Too unstable for CI at the moment

Detect video stream.

Fix artificial horizon (it was stuck)

Add Rattitude mode for PX4

* mavlink/master:
  Missed qDebug. Sorry for the commit deluge...
  Reducing PIP size on Android a bit. It was kind of big...
  Revert "Start logging on heartbeat instead of connect"
  Doc fix for getting gstreamer in to android build
  Adjustments to Telemetry Data
  Remove removed Widget
  Fixed Style for switch
  Fix opening DockWidget views
  Do not use the text() of the Action to show a DockWidget
  Translate the names of the Views
  Declare the Static Const Char on the .cpp file
  Do not let the Fullscreen/Normal be completely unselected
  Do not dynamic_cast QObject, use qobject_cast, it's faster.
  Support correct parameter set for APM

More small fixes v2

Support correct parameter set for APM