Made redo icon orange again.  Having distinct chroma is nicer
Moved Toolbox into its own package.
EditorToolBarButton: Now much smaller and draws border on hover
EditorToolbar: Removed 1px gap between buttons
EditorPrinter: Refactored; now prints immediately
EditorPrinter: Now shows an error message on failure.
Added DialogueAnswer enum
GUI: Added dialogues: warning, error, message, confirm, yes/no/cancel
CommonActions: Added addGridToggleListener() and updated printing stuff
EditorPanel: Grid drawing can now be enabled/disabled
EditorToolbarController: Linked grid toggle action
EditorPanel: Changing graphic states now causes a repaint
Camera: Added viewBbox() and setTransform()
EditorPanel: Added better support for printing