Make Styled target and style public

[davidkna]

This allows easily accessing and unstyled version of a Styled and allows amending a Style later on.

[jam1garner]

Making both fields public limits the possibility of future changes. I think these would be better as methods? alternatively the struct would need to be #[non_exhaustive].

[davidkna]

@jam1garner All the Style methods require full ownership, so I felt that exposing style completely makes sense. I will work on exposing the target with methods instead and keep style public.