Add support for .ufoz (UFO compressed ZIP format)

[NightFurySL2001]

According to UFO 3 Specification, a UFO folder may be compressed into a ZIP format file with the extension .ufoz. fontmake currently does not support it with the following error: fontmake: error: Unknown input file extension: xxx.ufoz

This will be a very good addition as CJK fonts that need to go up on Google Fonts has tens of thousands of glyphs that uploading the UFO folder is painstakeningly slow (without resorting to using Mac and Glyphs).

[NightFurySL2001]

Seems like ufoLib2 can open .ufoz files.

[anthrotype]

reopening as

#900 PR only adds support for reading .ufoz when passed in to the fontmake CLI without the explicit -u flag.
What's left to do for #887 is also allow ufoz as an additional output format for -o option. That would only be relevant for .glyphs inputs, of course (i.e. if one wants to convert a .glyphs file to a Designspace file + a set of .ufoz masters).

[NightFurySL2001]

Also noted that UFO will be generated when doing interpolation between UFO(Z) masters.

fontmake/Lib/fontmake/font_project.py

Line 945 in d918506

instance_ufo.save()

This will require verifying glyphsLib does support .ufoz file which I am unable to do at the moment.

[NightFurySL2001]

Actually just noticed there's this line that will need additional support for UFOZ too:

fontmake/Lib/fontmake/font_project.py

Line 228 in c6e41de

key = os.path.basename(master_path).rstrip(".ufo")