Add support for passive event listeners

[dfreedm]

Provide a way for elements to have passive gesture listeners with
this._passiveGestures = true

Fixes #4667
Fixes #3787
Fixes #3604

TODO:

• add tests

[TimvdLippe]

I have tried to write tests for this PR, but sadly unsuccessful. Yes the patch works, but there is no programmatic way of detecting if it did.

1. event.preventDefault() does not throw an error nor does it call console.error(). Instead, it shows the error in dev-tools but happily continues executing
2. On the internet I also found that event.cancellable should signal if you can cancel the event or not, however that is not working either. Even if you initially set cancellable: true for the event, passive: true does not alter this value.

The patch seems to be working, so /shrug

[dtapuska]

@TimvdLippe Tim you should be able to test this via calling preventDefault() and checking whether defaultPrevented was true on the Event.

[dfreedm]

After some thought, I don't think this approach is really workable. It requires individual elements to agree on setting passive, but at an application level, it may not be possible to know which element set the listeners that may affect scrolling.

Instead #4829 has a more limited version that is 100% app controlled.