Add STEPCode library
Add STEP export to GUI
Add STEPutil boiler plate for working with STEP file
Implement writing surfaces to STEP files
Update STEPCode library to latest master.
Force shared libs off
Correct library names on Windows.
Add missing Windows library
Attempt to force dependency of util on STEPCODE.

Some of the headers aren't generated until STEPCODE completes.  Anything
that depends on those should wait.
Update to latest STEPCode master 3/22/14