Simplifiy the ParaView build
Simplifiy the ParaView build

Use the default all plugins off CMake variable, and disable VTKm as we
don't use it in Tomviz (should reduce build times a little).

Signed-off-by: Marcus D. Hanwell <cf7042e2e8eee958b5bcde1ae2cbefef82efc184@kitware.com>

OpenChemistry/tomviz-superbuild,cjh1/tomviz-superbuild,OpenChemistry/tomviz-superbuild,cjh1/tomviz-superbuild