Add support for Browser.Events (subscriptions)

[avh4]

This issue is a tracking issue for the entire module, and smaller issues can be created for the discussion of individual additions:

• Animation
  • [ ] onAnimationFrame
  • [ ] onAnimationFramDelta
• Keyboard
  • [ ] onKeyPress
  • [ ] onKeyDown
  • [ ] onKeyUp
• Mouse
  • [ ] onClick
  • [ ] onMouseMove
  • [ ] onMouseDown
  • [ ] onMouseUp
• Window
  • [ ] onResize
  • [ ] onVisibilityChange