added a new xooie widget called carousel_v

carousel_v is a direct copy of carousel to be rewritten later
added carousel-v.html as a testing page for the new carousel_v widget

the page contains both a carousel (horizontal) and a carousel_v (vertical) to ensure both continue to work as I extend carousel_v
fixed carousel_v file naming mis-match
a mostly working carousel_v scrolling "right" (down) always scrolls to the second item.