Mouse related handlers

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	Class	Description
	BorderPanHandler	Handler that pan the map when the mouse cursor is close of the borders
	ClickHandler	ClickHandler detects a click-actions on the map: simple click, double click and drag&drop are managed.
	DragHandler	DragHandler allows to drag (pan) the map To use this handler, it's necessary to add it to the map.
	WheelHandler	Handler use to zoom in and zoom out the map thanks to the mouse wheel.
	WMSGetFeatureInfo	Handler allowing to get information about a WMS feature when we click on it.