KiCad OSD335x library

Switched over to using KiPart (from @Dave Vandenbout), and adapted Octavo's OrCAD part: https://github.com/graycatlabs/OSD335x-KiCad/blob/master/OSD3358-kipart.csv

Only took a couple minutes to make the many-unit symbol with KiPart!

I just started working on this moments ago - I'm mainly posting it now in hopes that someone will point out that the KiCad libraries already exist :P