[dev-context] Stretch charatcers

[luigi scarso]

function commands.LSws_hfilled(str,margin)
    local _
    _= margin and context.hfil()
    _=string.utfcharacters(str)
    context(_())
    for c in _ do
        context.hfil()
        context(c)
    end
    _=margin and context.hfil()
end

--
luigi