Clean lidarview.cmake
Clean lidarview.cmake

- Remove unused CMAKE_CXX_STANDARD
- Add EIGEN3_DIR for dependencies using modern cmake brought by Eigen 3.3
- Re-organize options for better clarity

Kitware/VeloView,Kitware/VeloView,Kitware/VeloView,Kitware/VeloView,Kitware/VeloView