DefineShape4 extends the capabilities of DefineShape3 by using a new line style record in the
shape. LINESTYLE2 allows new types of joins and caps as well as scaling options and the
ability to fill a stroke.
public DefineShape4(byte InitialVersion) : base(InitialVersion) { this._shapeBounds = new Rect(this._SwfVersion); this._edgeBounds = new Rect(this._SwfVersion); this._shapes = new ShapeWithStyle(this._SwfVersion); }