cosmic-text default features are all forced on

[sowelipililimute]

ATM there's no default-features = false or gating cosmic-text default behind glyphon default features, it's just all enabled all the time, which disallows me from disabling fontconfig support in my game to avoid system font config messing stuff up

[grovesNL]

I'd be ok with supporting this by gating default features/opting-out of defaults