* Create adapter for converting vertical layout into horizontal
* Fix edge spacing override for edges going out of switch statement.
* Update documentation.
* Rewrite node placement and edge routing parts of graph layout code
* Document the high level structure of layout algorithm
* Tighter layout and less edge crossings
* Better worst case memory and CPU usage
* Separate graph layout code from GraphView.
* Remove formatting and grid layout specific code from GraphLayout.
* Copy edge styles from from main graph view to overview.
