Merge branch 'master' of https://github.com/mavlink/qgroundcontrol into exportTileSet

* 'master' of https://github.com/mavlink/qgroundcontrol:
  Use QCoreApplicationName::applicationName()
  Add new single firmware mode from QGCOptions
  Allow custom build to override app name information
  Make compiler happy
  Changed follow vehicle user model
  MissionCmdUIInfo: New support for specifiesAltitudeOnly