move AccessModifierOffset to -4 (public:, private:, protected: are aligned to the left in Bullet)
https://github.com/bulletphysics/bullet3/issues/1007#issuecomment-286264717
_clang-format file and applied to HelloWorld.cpp usage: clang-format -style=file -i examples/HelloWorld/HelloWorld.cpp THere are still some issues with clang-format and its style