Macro help

macro_rules! help {
    (
        $( $section:expr => {
            $(
                $desc:expr => [ $( $key:expr ),+ ] $( ; observation => $obs:expr )? ,
            )*
        } )*
    ) => { ... };
}

Macro to create a vector of HelpSection from a list of sections and items.

Just a convenience macro to avoid writing the entire tree of HelpSections and HelpItems repeatedly.