Read parts from ZIP

As LDraw provide official as ZIP archives, add option for read parts directly from those ZIP's (without needs to unpack it into local folder)

• Official parts (latest release) - http://www.ldraw.org/library/updates/complete.zip
• Unofficial parts (latest; nightly) - http://www.ldraw.org/library/unofficial/ldrawunf.zip

FTR, LeoCAD could read such ZIP packages.

REFERENCE

• https://github.com/Symbian9/AWESOME-LDraw