organize the folder into a hierarchy and clean the cmake in the same time

CMakeLists.txt

SoftwareInformation/branding.cmake

VelodyneHDL/CMakeLists.txt

VelodyneHDL/Common/Network/vtkPacketFileReader.h

VelodyneHDL/Common/Network/vtkPacketFileWriter.cxx

VelodyneHDL/Common/Network/vtkPacketFileWriter.h

VelodyneHDL/Common/Network/vvPacketSender.cxx

VelodyneHDL/Common/Network/vvPacketSender.h

VelodyneHDL/Common/vtkVelodyneTransformInterpolator.cxx

VelodyneHDL/Common/vtkVelodyneTransformInterpolator.h

VelodyneHDL/Filter/BirdEyeViewSnap/vtkBirdEyeViewSnap.cxx

VelodyneHDL/Filter/BirdEyeViewSnap/vtkBirdEyeViewSnap.h

VelodyneHDL/Filter/MotionDetector/vtkMotionDetector.cxx

VelodyneHDL/Filter/MotionDetector/vtkMotionDetector.h

VelodyneHDL/Filter/MotionDetector/vtkSphericalMap.cxx

VelodyneHDL/Filter/MotionDetector/vtkSphericalMap.h

VelodyneHDL/Filter/OldPlaneFitter/vtkPlaneFitter.cxx

VelodyneHDL/Filter/OldPlaneFitter/vtkPlaneFitter.h

VelodyneHDL/Filter/ProcessingSample/vtkProcessingSample.cxx

VelodyneHDL/Filter/ProcessingSample/vtkProcessingSample.h