Refactor reimplementation of Option<T> Enum.

This Align Enum could be represented as Option<Aligned> instead. Ignore the branch name I was working on something else at first.

The reason why that enum existed I guess was that fn parse_align_mode(s: &str) -> Option<Align> needed to have a 3 states if I understand it correctly, so the following would be possible:

pub enum Align {
    None,
    Aligned { align: AlignMode, fit: FitMode },
}

fn parse_align_mode(s: &str) -> Option<Align> {
    match s {
        "none" => Some(Align::None),
        "bar" => Some(Align::Aligned { .. }),
        _ => None,
    }
}

The same states above are now represented by fn parse_align_mode(s: &str) -> Result<Option<Align>, ()>.

pub struct Align {
    align: AlignMode,
    pub fit: FitMode,
}

fn parse_align_mode(s: &str) -> Result<Option<Align>, ()> {
    match s {
        "none" => Ok(None),
        "bar" => Ok(Some(Align { .. }),
        _ => Err(_),
    }
}