Box2D

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dependencies:
- https://github.com/korlibs/korge-box2d/tree/v0.1.0/korge-box2d##44e6c32318de10107f28e4fe34f22597678f4559

Adds Box2d support to KorGE:

solidRect(920, 100).xy(0, 620).registerBodyWithFixture(type = BodyType.STATIC, friction = 0.2, restitution = 0.2)
for (n in 0 until 5) {
    //fastEllipse(Size(100, 100))
    circle(50f)
    //ellipse(Size(50, 50))
        .xy(120 + 140 * n, 246)
        .anchor(Anchor.CENTER)
        .registerBodyWithFixture(
            type = BodyType.DYNAMIC,
            linearVelocityY = 6.0,
            friction = 0.2,
            restitution = 0.3 + (n * 0.1)
        )
}