Doc fix for getting gstreamer in to android build

Revert "Start logging on heartbeat instead of connect"

Removing unused Main Flight Display widget.

Calculate/Display distance between waypoints

Start logging on heartbeat instead of connect

* mavlink/master:
  Making Altitude text Larger than the rest.
  Saving and Restoring "Map Is Main"
  Controls work better aesthetically when centered on the screen.
  More work on the Fly View

Flight view continue

Geodetic math

travis-ci enable QT_FATAL_WARNINGS=1 for osx

Disconnect Vehicle after 30 seconds of lost communication

Small fixes

Home Position unit testing for MissionController

Flight View Work

The current monitor used was the 'default' one, the primary monitor
but if your default monitor was the laptop one, with the lid closed
like mine was for quite a bit, you'd spend like 20 minutes trying to
find the preferences dialog, like I did.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

The QString behaves faster if used with const - reference on
a QForeach.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

if an unknown string was passed to createInnerDockidget,
the widget would not be created but a reference to the null
pointer would still be saved on the avaliable dock widgets,
and thus any code that foreached the list accessing methods
could led to a crash.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Since it's just a state-toogler, use the return value of the
method to set the values directly.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>