move existing OGS related files  in FemLib to OGS since FemLib should be used as a library for FEM
remove FemElem.* in MeshLib
add Integration in MathLib
temporally use Eigen for local matrix and vector. this might be changed in finial version
add the first FE class which is TRI3CONST
in progress to test TRI3CONST
add CoordinateSystem to MeshLib
add ElementCoordinatesMapping to MeshLib
add dummy functions to let compiling work
save progress in FemLib. compiling works but need to reorganize them from now
add normalizeVector() in MathTools
add BaseLib to include dir in FemLib
use -1
adjust to ogs6 meshlib
use LocalVector temporally
remove unused stuff
fix build errors