Add boolean invertDirection to allow inverting the scrollbar navigati…

[carolhmj]

…on direction.

Forum issue: https://forum.babylonjs.com/t/scrollviewer-horizontal-direction-is-in-reverse/32995/

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[RaananW]

I think invertDirection might be confusing. Maybe invertScrollDirection? invertDirection might be considered inverting the direction of the component itself

[carolhmj]

I think invertDirection might be confusing. Maybe invertScrollDirection? invertDirection might be considered inverting the direction of the component itself

Makes sense, changed the name!

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