[w3c/uievents] Need algorithm for how mouse events are fired (#196)

We need a algorithmic description of how mouse events are fired.

`mousedown`, `mouseenter`, `mouseleave`, `mousemove`, `mouseout`, `mouseover`, `mouseup`

See https://w3c.github.io/uievents/#events-mouseevent-event-order

Starting point:

```
1 mousemove  
(Pointing device is moved into element A...)
2 mouseover A 
3 mouseenter A 
4 mousemove A Multiple mousemove events
(Pointing device is moved out of element A...)
5 mouseout A 
6 mouseleave A 
```

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