Expand glyph set to GF Latin Kernel using parent design

[davelab6]

The glyph set in the 2 EDU 'hand' fonts is ~60, but since this produces tofu on fonts.google.com with very common punctuation like period and comma (example)
I propose to improve the build script to add the glyphs missing from the gf kernel set from the 'parent' fonts.

I chatted with @EbenSorkin about this for more context and he said he remembered talking to @simoncozens "about how this would be used and we reckoned that letters would be taught with dotted forms but that periods and some other things would not be and so giving those glyphs the treatment might be irrelevant"

Since I expect users will want to fallback those characters to the parent designs much more often than Arial, the Workspace default where no fallback configuration is possible, then I'm requesting this rebuild :)