Store UnknownCellSet instead of DynamicCellSet in DataSet

Kenneth Morelandrequested to merge
kmorel/vtk-m:dataset-uses-uknowncellset into master

UnknownCellSet is an updated replacement for DynamicCellSet. The next step in the replacement is to change DataSet to use the new class.

Also replaced DynamicCellSet with UnknownCellSet in a few places where DynamicCellSet.h was not directly included (and therefore now no longer included at all). This change would have to be made at some point anyway.

Edited by Kenneth Moreland

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