Paths ++

Adds new properties to paths to make them easier to work with:

• trimFrom
  • The start point of the path, between 0 and 1
• trimTo
  • The end point of the path, between 0 and 1. Animating this from 0 to 1 creates a "drawn in" effect
• pathStroke
  • Custom stroke for the path, conforms to the SVGStroke type