Gravity cubes in MRTK3's Hand Interaction Example Scene issue

[marlenaklein-msft]

This issue has been migrated a new MRTK repository, and the status of this issue will now be tracked at the following location:

• Gravity cubes in MRTK3's Hand Interaction Example Scene issue MixedRealityToolkit/MixedRealityToolkit-Unity#85

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In the Hand Interaction Example Scene, there are four cubes influenced by gravity which you can drop off the edge of the table. When they respawn, sometimes they jump/jitter for a couple of seconds before settling into place. By manipulating a cube, you can also knock over the lander and coffee cup, when the cubes are meant to be lighter than those objects.