Warn about Above Terrain usage

Disable closing app on last window close. This will close
the app on every widget spawned in QML that closes (MessageBox)

More takeoff item fixes

Fix QObject deletion

Fix gimbal pitch/yaw signalling

Fix gimbal yaw visual problems

Fix show/hide of click to set Launch location

Better wordings for Takeoff item

Fix for vehicle based home position management

Remove unused code

New user model for Takeoff item

Fix gradient calc

Fix incorrect usage of _settingsItem causing crashes

Group parameters with no metadata with the other existing params in the group, not in "Other"

Error display