all: remove support of numpy.matrix

benchmarks/bench-switch.py

include/eigenpy/eigen-to-python.hpp

include/eigenpy/numpy-type.hpp

src/eigenpy.cpp

src/numpy-type.cpp

unittest/CMakeLists.txt

unittest/python/test_complex.py

unittest/python/test_dimensions.py

unittest/python/test_eigen_solver.py

unittest/python/test_self_adjoint_eigen_solver.py

unittest/python/test_switch.py