Polish the Heart component

Information

• The package and version you used: @pencil.js/polygon v1.11.0

Description

A few things was missing from the first implementation of the Heart component.

• The trace function doesn’t take into account the heart position (this.position)
• The radius is not representative of the actual radius.
• The static from function is missing
• Missing link in the main Pencil.js readme.md

Reproduce by

// The heart won't be at the center neither will have a radius of 100px
const heart = new Heart(scene.center, 100, {
	fill: "red",
});
// missing function
const clone = Heart.from(heart.toJSON());

[zachary-nguyen]

@GMartigny Yep, that’s perfect thanks!

[zachary-nguyen]

You can assign it to me I already started progress and just finishing up 😃