Stable merge

Message ID buffer overrun

* 'master' of https://github.com/mavlink/qgroundcontrol: (37 commits)
  Update ISSUE_TEMPLATE.md
  Update ISSUE_TEMPLATE.md
  Create ISSUE_TEMPLATE.md
  Revert "Remove FileManager unit test"
  Revert "Temp removal of Onboard File"
  FileManager: fix upload complete
  QGCUASFileView.cc: fix upload complete
  Flight display: Fixed TypeErrors on startup without gstream installed
  Fix timeout logic
  10 sec timeout on vehicle
  Stack callsign below altitude
  Flight display: Create property variable
  Flight display: Remove video record button when gstreamer is not installed
  Add missing lib
  Flight display: Add callsign to transponders
  Add missing lib
  Better display of vehicle indicators for multi-vehicle
  Add support for ADSB vehicle display
  travis-ci fix indentation
  travis-ci fix google play deploy and quiet wget
  ...

Correct hiding of heading on TAKEOFF command

Plan: Update home position when loading plan after vehicle already connected

Re-enable FTP in menu

Fixups for building without gstreamer/videostreaming support

This reverts commit ac73682a.

This reverts commit 6620f803.

Previously, a completed file upload lead to this assert:
    Q_ASSERT(!_ackTimer.isActive());
because _closeUploadSeesion() was called twice, thus activating the timer
twice.

ADS-B vehicle timeout and stacked callsign

Linux: Add missing lib

Flight display: Add callsign to transponders

Linux: Add missing lib

Better display of vehicle indicators for multi-vehicle

Add support for ADSB vehicle display

More support in multi-vehicle view