use column-major order when constructing GLSL matrices

[reims]

Some functions in the vari part of rtg-math use row-major order when constructing matrices. These matrices then cannot be used with normal GLSL operations because GLSL uses column-major order.

This pull request changes this for most of the functions that construct matrices.

I did not check all functions for this issue. Missing are (in m3 and in m4)

• rotation-from-euler
• adjoint
• from-direction
• point-at
• look-at