v1.8.0

Additions

• Santa hats
  Just use santa or santa-{hat name}. The available hat names are: hat, trumpet, star, candles, gift, pretzel, letter, train, and house
• Add santa option to enable santa hats by default

Fixes

• Fix upvars
• Fix snap spacing
• Fix scratch2 rings
• Make snap rings look better
• Allow icons to be in variable names
• Fix arrow icons in scratch2 and scratch3 styles
• Make loop icon respect zebra coloring