Update SensorsStatus.qml

Added units to sensor readings in accordance with Qt documentation.

Accelerometer, see http://doc.qt.io/qt-5/qaccelerometerreading.html

x, y, z (m/s/s)

Altimeter, http://doc.qt.io/qt-5/qaltimeterreading.html

altitude (m) relative to mean sea level

Compass, see http://doc.qt.io/qt-5/qcompassreading.html

azimuth (º)

calibration level, no unit.

GPS, see http://doc.qt.io/qt-5/qml-coordinate.html and http://doc.qt.io/qt-5/qml-qtpositioning-position.htm

latitude (º)

longitude (º)

horizontalAccuracy (m)

altitude (m) above sea level

verticalAccuracy (m)

speed (m/s)

Gyroscope, see http://doc.qt.io/qt-5/qgyroscopereading.html

x, y, z (º/s)

Pressure, see http://doc.qt.io/qt-5/qpressurereading.html

pressure (Pa)