Component + alternate update

[yannickmathey]

If you change to another alternate, glyphs using this component will not be updated. e.g. \¢ in Grotesk Template

Set the \c to ball terminaison. Display \¢ — it should have a ball as well. Go back to classic terminaison on the \c >>> the \¢ does not follow.

[FranzPoize]

It should be discussed on how we feel this should be done. There is a lot of different way to do that. Some I think uniquely in prototypo.js (like providing a way to depend on a rendered unicode instead of another glyph) and some with some change necessary in prototypo (like making class of alternate that should be switched all at once)