Z from thickness / color #81

Hello Sameer,

Thanks for you tool, I really appreciated it. It works incredibly fast compared to Inkscape.
I am playing with pen drawing machine and wondering how difficult would it be implement Z position of the pen from thickness or color of the line in the SVG.
It could give us more options:
Different layers could work as an Layers
Gradients on the line as dynamic pressure imitation / or maybe laser intensity
or
Grayscale of the line could as well drive other motor for example pressure screw or rotating of the brush.

best

Thanks