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Reduce compiler memory usage by removing auto hxx inclusion

Robert Maynard requested to merge robertmaynard/vtk-m:remove_filter_hxx_usages into master

A large portion of the VTK-m filters are now compiled into the vtkm_filter library. These pre-built filters now don't include the respective hxx file to remove the amount of template instantiation users do.

To verify that this removal reduces compiler memory ( and maybe time) I profiled the compiler while it building filter tests in debug mode. Here is a selection of results:

  CleanGrid           10.25s => 9.01s,  901MB => 795MB
  ExternalFaces       13.40s => 5.96s, 1122MB => 744MB
  ExtractStructured    4.69s => 4.75s,  492MB => 492MB
  GradientExplicit    22.97s => 5.88s, 1296MB => 740MB
Edited by Robert Maynard

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