Make eventlisteners passive

[0xhtml]

Chrome DevTools suggest marking the eventlisteners on touch, scroll etc. events as passive, as long as the listeners don't need to cancel the event, to improve performance. I would think that doing so might slightly improve performance and would at least silence the devtools complaining.

[leofeyer]

Can you create a pull request with the necessary changes?

[0xhtml]

I implemented the passive event listeners 0xhtml@5d7883c and the chrome devtools no longer complain. However, there seems to be a bug in Firefox with the non-passive touchmove event listener that is registered inside the now passive touchstart event listener: As far as I can tell is the cancellation of scrolling is not working even though the touchmove event is registered as non-passive and therefore should be cancelable. Works in chrome though.

[0xhtml]

Reported the bug to Mozilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1839095