Added jquery, scoreboard, loading message + more

Added:
* jquery
* a visual scoreboard
* made the game wait for both players to join
* stopped most input before game starts
* loading message with a %,
* cursor in loading state when game is loading, and crosshair when
playing

Also updated all libraries, but old ones should work fine.
Scoreboard and loading bar click through, and are just overlays

Also fixed a scrolling bug, where you could still scroll down past the
game window, revealing white space.