[WIP] Implement MouseGestureHandler

[ilyasakin]

I consider this main implementation to be somewhat finished and ready to be reviewed.

There are still some issues that need tracking and need to be addressed in this PR -which I plan to address in couple of days-:

• [ ] In the tab-view component we use touchend event instead of tap. Which is not compatible with this implementation. But, mobile will still work. Not sure if this is a breaking change.
• [ ] If you change tab-view component's touchend event to tap. It does work but, it also clicks the item underneath it. For example, in erste-demo, if you click Shows with a mouse, it will also click a movie. I'm suspecting this is some sort of an event-bubbling issue.