Smooth Motion in Unity (refactored)

This is an improved (refactored) version of the code from the "Timesteps and Achieving Smooth Motion in Unity" article.

Now, there are only 2 components instead of original 3:

1. InterpolationFactorController a singleton scene component (the original name was InterpolationController) that calculates the current interpolation factor.
2. InterpolationObjectController a component for a moving object (the original name was InterpolatedTransform) which calculates the current interpolation for the object in the Update() method before it's being rendered and then restores its original transform values for the next FixedUpdate() call.
3. The InterpolatedTransformUpdater component was removed as unnecessary.

Remarks

For these scripts to work correctly the user's script must change the object's transform only in the FixedUpdate() method. When teleporting the object the user should call the (InterpolationObjectController).ResetTransforms() method after it.