[Bf-committers] Change Representation and Initialisation of Matrices to Conform with Standard Notation

[Dima Glibitsky]

By the way, how slices would be handled in this case?
If I recall correctly, currently you can write e.g. matrix[0] to get a
4-vector of X-axis of transform matrix, or e.g. matrix[2][:3] to get
3D-vector of Z-axis.