mousewheel support, left side menu mouse interactivity

added mousewheel navigation of cards, still need to get cards to play
nice with high speed mousing and maintain correct order at all times.

added mouse interactivity with left side menu - presented problems with
left side menu not receiving mouseover events, but pushed onto the gpu
and forward in Z by 1px and problem solved. still need to tie which card
is current with which menu item is highlighted. also need to build
"cardsTo" function to navigate directly to a card when a menu item is
clicked.