Merge remote-tracking branch 'mavlink/master' into toggleMapButtons

* mavlink/master:
  Increase size of controls for tablet
  Make sync warning less tall
  Use Flickable to allow scroll on Tablet
  More header fixes for Mobile build
  More header moves for Mobile build
  More header moves for no widgets in Mobile build
  Move widget controllers out of Mobile build
  QGCUnconnectedInfoWidget needed in Mobile builds
  Remove widget code from Mobile builds