SensorFaceController: Create QQmlEngine for configs at class initialization
As per discussion in !344 (comment 940912)
Instead of creating new engine every time, just create new engine at class initialization and reuse it.
(cherry picked from commit 56fdd141)
c7ea7e39 SensorFaceController: Create QQmlEngine for configs at class initialization 09a4885e Set configEngine as SensorFaceController constructor parameter