Selection: Added placeholders for cut/delete
Added EditorCreationParam class
EditorComponent: Added constructor with angle
EditorWorld: Added clearGraphicSelectionAndHighlightStates()
HistoryManager: Added getTotalBytes() to monitor mem usage
Tool: Added reset() and getToolManager()
ToolContextual: Now participates in undo/redo system.  Added reset()
ToolHighlighter: Added reset()
ToolManager: Now uses reset; changed to use creation params
ToolPlacer: Can now rotate component; now participates in undo/redo
Added reset()
Bbox2: Added getEnclosingRadius()
Added placeholder class EditorComponentTrace