`writeline` ignores styled printing

[nick-paul]

`writeline` ignores styled printing

[Clemapfel]

I solved this partially by modifying the writeline like so:

function TerminalMenus.writeline(io::IO, menu::RadioMenu, cursor::Int, iscursor::Bool)
    printstyled(IOContext(io, :color => true), (iscursor ? "> " : "  ") * menu.options[cursor], reverse=true)
end

However, as header() only returns a raw string, you instead need to add a header_printed variable to your menu class, then modify header like so:

function TerminalMenus.header(m::Menu)
        if !m.header_printed
            printstyled("foo", reverse = true)
            println();
            m.header_printed = true
        end
        return ""
    end
    ```
    
    This solves this issue which I am very happy about, now my menus look much more pretty