Support of ligatures should be configurable

[wszydlak]

Starting with webfont@10 which added support for ligatures all glyphs are generated for 2 unicodes, the second one is for ligature.
This also leeds to generation bigger svg font file (cause it generates for all unicodes).

It would be nice to ha e an option to avoid such behavior and eg. disable ligature support.

Maybe this only needs to add one if in

webfont/src/standalone/glyphsData.ts

Line 66 in c5fa8fe

metadata.unicode.push(metadata.name.replace(/-/gu, "_"));