changed signs and fix split on multiple lines

plugin/umbrella.vim

highlight UmbrellaNone ctermfg=15 ctermbg=1 guifg=White guibg=Red
" Declare signs.
sign define UmbrellaCovered text==] texthl=UmbrellaCovered
sign define UmbrellaPartial text==| texthl=UmbrellaPartial
sign define UmbrellaNone text==[ texthl=UmbrellaNone
sign define UmbrellaCovered text=°° texthl=UmbrellaCovered
sign define UmbrellaPartial text=÷÷ texthl=UmbrellaPartial
sign define UmbrellaNone text=×× texthl=UmbrellaNone
function! s:Initialize()
    let s:coverage_systems = {
            if bufexists(l:parts[0])
                if len(l:parts[1])
                    exe ":sign place 1 line=" . l:parts[1] . " name=UmbrellaCovered file=" . l:parts[0]
                    for n in split(l:parts[1], ",")
                        exe ":sign place 1 line=" . l:n . " name=UmbrellaCovered file=" . l:parts[0]
                    endfor
                endif
                if len(l:parts[2])
                    exe ":sign place 1 line=" . l:parts[2] . " name=UmbrellaPartial file=" . l:parts[0]
                    for n in split(l:parts[2], ",")
                        exe ":sign place 1 line=" . l:n . " name=UmbrellaPartial file=" . l:parts[0]
                    endfor
                endif
                if len(l:parts[3])
                    exe ":sign place 1 line=" . l:parts[3] . " name=UmbrellaNone file=" . l:parts[0]
                    for n in split(l:parts[3], ",")
                        exe ":sign place 1 line=" . l:n . " name=UmbrellaNone file=" . l:parts[0]
                    endfor
                endif
            endif
        endfor