I see that this list is getting bigger and bigger. Can we do something like `aria.utils.Event._getType`. We could keep a map of events

Line 96 become
````
-  this.type = this.type.toLowerCase();
+ this.type = this._getType(evt.type)
````

Doing so you can remove `type` from `eventMap`.

`_getType` then groups those new events and the ones already there like `focusin`, `focusout`

The code should be smaller