QTI 2.1: implement Pointer Events in drawingInteraction for better compatibility with Window's pens

In the drawing interaction:

• Implements the event handling for pointer events API
• Optimise canvas drawing and dropped same points
• Optimise drawing on the canvas by using "requestAnimationFrame"
• Prevent double stop which results in drawing twice a circle or an other form (can be seen if the circle is transparent)
• Remove listener on document element or after using them

Important: check that the menu "More" still works after playing with the drawing interaction