hdtilt 0.3.2: big ▲ ▼ page buttons on TVs

On a TV browser (Silk on Fire TV, Android TV, webOS, Tizen), every list gets big ▲/▼ page buttons: channels, Movies & Shows, the TV guide and the category rails. A TV's pointer can't scroll a list inside the page, so long lists were out of reach. Use ?pager=on or ?pager=off to turn them on or off on any device. Details: #25