Adding colors to wpc_ps

[edb]

Hello,

I've added color support to wpc_ps so it can have some colors imported like the svg importer, my changes are at the branch:
eb/ps-additions.
I'll make a pull request after some more testing. I haven't made huge changes as postscript as a file format seems very complicated.

Also an installable beam file: wpc_ps.tar

I've tried to find some files to help with testing, I saw the thread but the google drive link seem to be gone: http://www.wings3d.com/forum/showthread....279&page=2