iTowns / itowns / 1201

65%

master: 87%

Pull #1287

travis-ci-com

feat(controls): use a more global div for event listening

In every `Controls`, the `div` that was listened was the `canvas`. Now
it it the parent of this canvas, usually named `viewerDiv`.

In the same time, the usage of `offsetX/Y` has been changer to
`clientX/Y`.

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