GraphicTransHint: Magic numbers removed
IconEnum: Added selection icons
Added selection icon resources
ToolTraceDrawer: Removed useless key listener
ToolTraceDrawer: Right-click now performs backtrack and cancel
EditorMenuBar: Added select items to Edit menu
Actions: Fixed Toolbox not having its ToolManager set on toggle
EditorMenuBar: Added Alt+F4 accelerator to Exit
Actions: Added selection actions
ToolManager: Added selection handling methods (resets active tool)
EditorCreator: Hooked up selection actions
ToolManager: Fixed selection-clearing issue on history change
ToolContextual: Fixed not repainting when selecting via shortcuts
HistoryManager: Added CallbackSet for undo/redo events