[Indentation] Reindentation of all the code

include/curves/MathDefs.h

include/curves/bernstein.h

include/curves/bezier_curve.h

include/curves/bezier_polynomial_conversion.h

include/curves/cubic_hermite_spline.h

include/curves/cubic_spline.h

include/curves/curve_abc.h

include/curves/curve_constraint.h

include/curves/curve_conversion.h

include/curves/exact_cubic.h

include/curves/linear_variable.h

include/curves/optimization/OptimizeSpline.h

include/curves/piecewise_curve.h

include/curves/polynomial.h

include/curves/quintic_spline.h

include/curves/serialization/archive.hpp

include/curves/serialization/eigen-matrix.hpp

python/archive_python_binding.h

python/curves_python.cpp

python/python_definitions.h