Integrate matrix multiplication functions into new framework

Integrate several matrix multiplication functions (Matrix4D x Matrix4D,
Matrix4x3 x Matrix4x3, Matrix4x4 x Matrix4x3, Matrix4D x Vector4D[4] and
Matrix4D x Vector4D[n]) into the new SIMD framework. Several others
still have to be integrated. The new implementation has  not yet been tested.

Signed-off-by: Harm Hanemaaijer <fgenfb@yahoo.com>