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

* 'master' of https://github.com/mavlink/qgroundcontrol: (95 commits)
  Only mobile limits line length
  Drag support
  Fix indicator
  Correct background color
  Fix parameter mapping
  No max altitude
  Fixed support for closing all guided dialogs
  Core plugin can override Value Widgets default settings
  Add flightTime to Vehicle FactGroup
  Add support for valueTypeElapsedTimeInSeconds
  Max default mission altitude is 400ft
  Mention voiding warranty in show advanced ui confirmation
  Still trying to fix merge
  Fix merge
  Support load/save/default of NaN for param
  Allow core plugin to disable multi-vehicle
  Stop trying to pull from vehicle
  Support load/save/default of NaN for param
  Add support for FMUv4PRO and FMUv5 boards
  Remove WIP
  ...