promote watchlist and login functionality to stable

Rename module to watchstar (to prevent confusion with watchlist
special page module)
deprecate hasSecondaryNav class (it always has secondary nav now)

cleanup styling of watchlist icon to share hamburger menu positioning
ensure the X in the search box lines up with the stars in the search
results

make Watchlist special page module depend on watch star module so
that it can add the watch stars to pages in the watchlist

Fix broken watchlist special page so that it shows watch stars
and thumbnails on alpha (broken selectors/watch star only added for
alpha)

For basic site show the search button in the space of the watch star
and do not show the menu items login/logout or watchlist

Change-Id: I2b869097cd45716628f256cf8ce4eb89f6154ed2
Merge "promote watchlist and login functionality to stable"