Nfdemo

Added two mappers, for nearField and FarField processing, respectively. Note: The SatieOSC-nodeHandler method nodeUpdate had to be adjusted to include the "distance" parameter that it has always received in the osc update message. However, now it also forwards the distance parameter to the node. This was not a bug, but an incomplete implementation, left over from the spatOSC days, when the distance parameter was not used by the spatializers.