Feature drawing related handlers

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	Class	Description
	DragFeatureHandler	DragFeature is use to drag a feature To use this handler, it's necessary to add it to the map It dispatch FeatureEvent.FEATURE_DRAG_START and FeatureEvent.FEATURE_DRAG_STOP events
	FeatureClickHandler	Depracated, should be removed in favor of SelectFeaturesHandler This handler has been created in particurlaly for The edition mode It allows the user to differenciate click from double click and drag/drop
	SelectFeaturesHandler	Select Features by clicking, by drawing a selection box or by drawing a freehand selection area.