Matrix / Vector template implementation

[AODQ]

Not really a need to have multiple header implementations of matrix / vectors. There should only be one implementation of matrix / vector, of course OSG makes this difficult but hopefully it is possible.

Example vector implementation

template <size_t Len, typename T> struct Vec {
  std::array<T, Len> data;
};

template <typename T> struct Vec<3, T> final : Vec<0, T> {
  Vec3<3, T> normalized();
};