Add Wandercraft copyright where needed.

CMakeLists.txt

src/CMakeLists.txt

src/math/sincos.hpp

src/multibody/joint/joint-base.hpp

src/multibody/joint/joint-free-flyer.hpp

src/multibody/joint/joint-planar.hpp

src/multibody/joint/joint-prismatic.hpp

src/multibody/joint/joint-revolute-unaligned.hpp

src/multibody/joint/joint-revolute.hpp

src/multibody/joint/joint-spherical-ZYX.hpp

src/multibody/joint/joint-spherical.hpp

src/multibody/joint/joint-translation.hpp

src/multibody/model.hpp

src/multibody/parser/sample-models.hpp

src/multibody/parser/urdf.hpp

src/multibody/visitor.hpp

src/python/explog.py

src/python/module.cpp

src/python/python.cpp

src/python/python.hpp