refactor volumetric_deformation to use evaluators

[ecoon]

Currently volumetric_deformation is based on two enums:

a "DeformStrategy" which is algorithmic (global optimization vs MSTK's internal vs cell-to-node averaging) and describes how to go from cell volume changes to nodal coordinate changes

a "DeformMode" which describes how to calculate the volume changes.

Clearly the latter should go to evaluators. The former probably can't.

Also, there is an implied dependency on base porosity that isn't required.

Also, keys are hard-coded.

Also, global optimization uses a very old matrix -- does this code-branch even work? This in particular needs regression tests, as it tests MSTK as well which can be fragile.

[ecoon]

Some of this has been resolved, some of this has been deleted, and some of this may still be applicable. Ignoring it for now.