Renamed v3FromVertexMirrored and v3ToVertexMirrored to v3ImageEdgeReceiverStart and -End in CPropagaionEdge because they are the receiving points of the imaged edge. Also added v3ImageEdgeSourceStart and -End in CPropagationFace for the calculation of the mirrored emitting points of the last edge in front of the face. The mirroring is added to the ConstructImageEdges() function.