Sensors examples: Use resource system for QML examples

Adds resources (.qml, .js, images, etc.) used in QML examples as
Qt resources. This enables running the examples successfully when
shadow building, without copying the files around.

Task-number: QTBUG-31076
Change-Id: I0f3352cffdc334f6139aac60acd3345710516d65
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lorn Potter <lorn.potter@jollamobile.com>