Some Matrix Maths for OpenScad

Sometimes I find myself getting lost in the declarative transform world of OpenScad...

translate()
rotate()
scale()
rotate()
.
.
.

Then I smacked my head and discovered 'multmatrix()'

I know you, as I, have often wondered, 'what is the multmatrix?'

This thing is the answer. Basically a bunch more matrix routines to make life in OpenScad easier. Really I'm releasing this particular bit of work because I want to write an expose on declarative vs imperative programmi