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Use ArrayGetValue where possible in worklets.

Allison Vacanti requested to merge allisonvacanti/vtk-m:391_reduce_device_transfers into master

Replace code such as myArray.GetPortalControl().Get(0) with vtkm::cont::ArrayGetValue(0, myArray), which will just retrieve the single value without transferring the entire contents of myArray to the host. This should prevent memory thrashing.

Also did some general style clean-ups and fixed loops that called GetPortalControl in the loop body.

Fixes #391 (closed).

Edited by Allison Vacanti

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