use ldraw zip archive as alternative to ldraw directory

[nathaneltitane]

Is your feature request related to a problem? Please describe. Allow the user to select a directory containing a zip archive of the ldraw parts library as option.

Describe the solution you'd like Use zip archive of ldraw library instead of an unpacked folder - detect ldrawunf.zip as well (see leocad code for details - screenshot from leocad)

Describe alternatives you've considered n/a