Added a WaferGridXY cartesian segmentation for SiWEcal. The SiWEcal include...

 Added a WaferGridXY cartesian segmentation for SiWEcal. The SiWEcal include both Normal wafer and Magic wafer depending on the layer dimensions. Implemented a new algorithm to transfor the SiWEcal04 sensitive driver into DD4hep framework. This algorithm works for both Normal and Magic wafer design.