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 (meters/second/second)

Altimeter, http://doc.qt.io/qt-5/qaltimeterreading.html

altitude (meters) relative to mean sea level

Compass, see http://doc.qt.io/qt-5/qcompassreading.html

azimuth (degrees)

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 (decimal degrees)

longitude (decimal degrees)

horizontalAccuracy (meters)

altitude (meters) above sea level

verticalAccuracy (meters)

speed (meters/second)

Gyroscope, see http://doc.qt.io/qt-5/qgyroscopereading.html

x, y, z (degrees/second)

Pressure, see http://doc.qt.io/qt-5/qpressurereading.html

pressure (Pascals)