Parametric Space Truss Platform

Using my space truss module, creates a "platform" with user configurable length, width, and height. Automatically generates the (possibly hundreds of) cylindrical members and does all the trigonometry for you!

EDIT: Using changes to my space_truss() module suggested by qharley, the SpaceTrussBridge files have more diagonal members crossing in both directions.

I also removed a bunch of translate()'s from the sub-modules in the hopes of speeding up the program. Some are still necessary to mo