REFAC: Remove VisualModel geometry constructor, prefer set/get

Andrew Wilsonrequested to merge
andrew.wilson/iMSTK:VisualModelFix into master

Removes constructor init for VisualModel. Then replaces all usages of it.

The constructor is is at odds with the set/get. As of currently, geometry is not required for a VisualModel. Additionally this sets it up for runtime changes & easy factory construction.

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