JavaScript transliteration

Add a JavaScript transliteration. Because the JS was slow, fix up the check_winner() and color_winner() functions to only check the losing triplets and winning quads around the last move. Speeds things up considerably. I added this back to the Golang version. Both JS and Golang include changes to the position bias - edges and corners are high score instead of centers. Seems to make it a better opponent.

Good enough for others to see.

v1.0

Add notes about game phases.