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Fix issue #456 Change the `modifyValueOnWheel` default behaviour to act only when the element is focused

Add a new `wheelOn` option that will define when the `wheel` event will increment/decrement the element value.
By default the `wheel` event is only used when the element is focused (`wheelOn` is set to `'focus'`), but you can also use the `'hover'` option if you want to keep the previous behavior.
Note: There is a small caveat since the `Shift + mouse wheel event` is reserved by browsers for horizontal scrolling, using the `Shift` key and the `wheelOn` option set to `'hover'` will only scroll the page while the mouse *is hovered* over the AutoNumeric-managed element. Once it out of the way, the page won't scroll since you'll be holding the `Shift` key. You'll then be able to scroll the page normally without having to hold the `Shift` key.

Signed-off-by: Alexandre Bonneau <alexandre.bonneau@linuxfr.eu>

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