Source for Realize applet

• Realize is the top level applet. It creates all the GUI components and processes events from them. Includes code for generating random bracket strings
• PolygonCanvas is a Canvas that processes events in the polygon drawing area.
• PolygonTri has the responsibility of drawing the triangulated polygon and calculating the positions of the vertices so the polygon is a Delaunay triangulation.
• SortableVector extends Vector to allow the sorting of Vectors of Objects that implement the Comparable interface.
• Point2d represents 2d points with floating point coordinates.
• Edge represents a single edge of the triangulation.
• StackLayout is a LayoutManager that lays out components in a vertical column. I didn't write it.