pointer: Replace old primitives with createPointers

[thetarnav]

It's probably a good time to remove that crap that was the pointer package and replace it with a simple, but actually useful primitive.
The old api was just an experimentation that ended up too complicated and not at at useful. The package is not used much either judging by the downloads.
The new createPointers primitive is simple, but it something I would use, it just gives you a list of pointer events of pointers that are currently on the screen. All the other magic like position_to_element, is_inside and is_down can be derived from this list, and I'll be adding examples how to do that to the readme later.

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