MindMap: partial implementation

Conflicts:
	org.flowerplatform.editor.model/flex_src/org/flowerplatform/editor/model/DiagramEditorFrontend.as
	org.flowerplatform.editor.model/flex_src/org/flowerplatform/editor/model/remote/DiagramEditorStatefulClient.as
	org.flowerplatform.web/launch_configs/Flower Platform - Web.launch