Automaticaly find eigen3 #448
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Now we have to set the CMake variable
EIGEN_INCLUDE_DIRmanually when installing libpointmatcher on Windows.It would be simpler to use the environment variable
EIGEN3_INC_DIRadded when installing Eigen.To make this changes, I was inspired by the FindEigen3.cmake file from CGAL.
I didn't take the whole file which is very complete and secure, but only the part that find Eigen path.
I was not able to test these modifications on Linux. So it should be done before merge.