Merging Dashboard branch that introduces the Dashboard, DashboardItem and moves most of the screen rendering code into a component-based layout that can also be displayed as a screenspace renderable
* Add Onscreen Dashboard
* Add Dashboard class
* Add DashboardItem classes and subclasses
* Added font and fontsize customization to dashboarditems
* Add default dashboard specifications to all scenes
* Add tests.scene to test dashboard items
* Add configuration options to DashboardItemDistance
* Fix distance conversion to correctly use singular or plural values
* Make DashboardItems unique when adding them to a dashboard
* Correctly position test with different font sizes
* Add Dashboard Item that enables spacing between other items
* Add performance measurement to dashboard rendering
* Add method to DashboardItemDistance that computes distance to surface
* Add DashboardItemAngle that computes and prints the angle between three objects
* Add DashboardItemInstruments that shows the instruments on New Horizons
* Add ability to OpenSpaceModules to return a list of Luascripts defined by child objects
* Make it possible for ScreenSpaceDashboard to work with its own dashboard or the main one
