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Move lookup table opacity check from actor

Cory Quammen requested to merge cory.quammen/vtk:move_lut_opacity_check into master

The mapper, not the actor, should be responsible for checking whether its lookup table is opaque. Prior to doing so, it should ensure the lookup table is built. This eliminates the need to explicitly build the lookup table in certain situations (it should never be needed).

Removed an explicit call to vtkLookupTable::Build() in one of the tests that shouldn't have been needed in the first place.

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