Merge topic 'remove-vtkm19'

3fd3fa7f use script to install cmake with Dockerfile
f4b8eac0 update vtkm version in readme and user guide
f748da9c update to use vtkm 2.1 in docker images
e301a226 remove vtkm 1.9 builds from CI
425447a2 remove guards for building with vtkm 1.9

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !164