Yet more cleaning

PX4FLOW Sensor Support. @LorenzMeier Can you please try this and see if the image comes across fine?

appveyor don't deploy pull requests to s3

Cleaning old cruft.

Separate Settings Panel

Fix checkbox aligment.

The debug dialog is temporary and it only shows in debug builds. I was trying to collect data on screen size and density for various devices. I might leave it there a little longer (still only for debug builds) until we're comfortable with the UI across all devices.

Yes, we need to group these settings a little better. I think it's just a matter of shuffling things around. One *Root* setting window that branches off into *General*, *Vehicle*, *Joystick*, etc. I will wait for @DonLakeFlyer  to be back so we can figure this out.

In the mean time, I will merge this in as is as it provides a service regardless.

Ui tweaks
Looks like it finally passed!

Disable COM_RC_IN_MODE magic handling, as its causing confusion on al…

Disable COM_RC_IN_MODE magic handling, as its causing confusion on all autopilot stacks. This is a developer thing which is actually much easier to not expose, even for the involved developers.

Adding a confirmation dialog for when arming vehicle.

Toolbar work

* mavlink/master: (30 commits)
  android lower minSdkVersion to 16
  Update README.md
  Fix G constant, emit updates more regularly
  QGC: Fix excessive noise terms
  check for new and old flightgear path
  set correct path to flightgear executable on osx
  fix android auto versionName update
  travis-ci try installing PyOpenSSL with pip
  travis-ci add python-openssl for google play publish
  travis-ci run doxygen config last
  travis-ci pip install --user
  travis-ci install google-api-python-client
  fix travis decrypt google play credentials
  android auto version and deploy to google play
  update android version
  Remove Flightgear and JSBSim and only leave the option which actually works.
  Wait after window close to prevent qml warnings
  Restructure to prevent shutdown warnings
  QT_FATAL_WARNINGS back on
  Remove remaining singletons
  ...

Conflicts:
	src/FirmwarePlugin/PX4/PX4FirmwarePlugin.cc

android lower minSdkVersion to 16

-simplify clone step

Update path to executable for FlightGear on OSX