orbit_controls.dart is broken due to browser changes

[muth02446]

• using the mouse-wheel fails inside dartium
  a field name has changed
  wheelDeltaY => deltaY

• when transpiling to JS and running in chrome 44 another failure occurs when using the mouse:

  Uncaught TypeError: $event.get$clientX is not a function

  which I have not been able to track down yet

[muth02446]

Possibly relevant for the second problem:

dart-lang/sdk#15216

[muth02446]

the second problem can be fixed by rewriting
clientX => client.x