- We have to switch to 'onpointerdown' & 'onpointerup' in order to actually capture `e.pointerType`
- this replaces 4 event listeners (MouseDown/MouseUp/TouchStart/TouchEnd) with 2 pointer ones which should fire in all 4 scenarios. We still output the old types according to the MouseInteractions enum
- there is no Pointer equivalent of Click, so we leave that is, but use the last Pointer event to attach a pointerType to (only) the click event, where it is most useful
- we can fallback to the old method for any browsers not supporting `window.PointerEvent`, in which case \`pointerType\` will be absent from all events
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