[Zest 2.0] Refactor Layouts example to Zest 2.0 API #571
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This adapts the SimpleNode, SimpleConnection and SimpleGraph classes of the example project to implement the NodeLayout, ConnectionLayout and LayoutContext interface, respectively, replacing the old Zest 1.0 interfaces.
Those classes are used by the SimpleSwingExample and SimpleSWTExample snippets to layout randomly generated graphs. Both examples have been updated to support the new layouts. Most noticeably, the nodes and connections are now exclusively stored in the layout context.
Furthermore, those classes have been cleaned up, including: