Add support for named center & radius arguments to Path.Ellipse.
Docs: Improve Path constructors.
Docs: Various smaller clean ups.
Have Path.Ellipse constructor support negative radius values correctly.
Docs: More smaller fixes.
Improve Shape.Ellipse to support center & radius parameters, and update documentation.
Implement Shape#clone()
Implement efficient filtering of already consumed values in argument reading from object literals.
Fix SVG error in importing transformed gradients with highlights.