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

Adjustments to Telemetry Data

Doc fix for getting gstreamer in to android build

Revert "Start logging on heartbeat instead of connect"

* mavlink/master:
  Removing unused Main Flight Display widget.
  Start logging on heartbeat instead of connect
  Correct for relativeAlt, !relativeAlt, homePositionValid mix
  Fix relative altitude fact
  Calculate/Display distance between waypoints

It was kind of big...

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Too used to Kernel Formatting Style.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

The dock widget opening system had several issues,
1 - it didn't deal with translations
2 - it didn't deal with accelerator keys
3 - it crashed if passed a invalid string (like when using KDE, happened
for all options)

This new way of using the views are slightly different:
1 - no more string comparissons, use integer comparissons (much faster)
2 - do not use a convoluted if/else - switch simplify.
3 - do not create two different static variable strings for the same stuff
4 - create an enum / an vector of strings (the enums bein an index of it)
to acess the correct view.

The overall code is clear than the old one, and faster.
the only point where the code isn't as clear is on the call to
showDockWidgetAction, since we passed a string that had the
name of the Widget, but now the action only holds the index
for the name in the string vector, I first need to get the
correct string and send it.

Tested here closing and reopening the app and verifying that
the dock widgets that where left open are still open when
reopening the application.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

The text can be translated, the text can have accelerator-special
key, so the text is unrealiable. the only thing reliable is the data,
wich stores a pointer to a fixed , unmutable, string.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

We where passing the QActions untranslated.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Since the Static const char * items are private and nothing
should access them besides the MainWindow class, declare
them inside of the .cpp file with static linkage, this way
a few good things happen: they are not exported as symbols
to any other class (not even with private linkage) and also
if we need to add a new one, on the .cpp, the only compiled
file will be the cpp, instead of the tons of files that include
mainwindow.h
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>