Cleanup component attributes

[pedrokiefer]

Component attributes that are shared across many components should be documented in only one place.

[GCorbel]

@pedrokiefer why? You want one place for all parameters but they're not applicable for all inputs. I like it like that.

[pedrokiefer]

It's been a while since I've opened this issue but if I recall the problem was that lots of attributes where undocumented, and some where repeated in all components. I think the ones that are repeated could end up in a generic description of what a component is, which is also something that we don't have.