ENH: snappyHexMesh: added mesh shrinking as separate library

src/mesh/autoMesh/Make/files

.../autoMesh/autoHexMesh/autoHexMeshDriver/autoLayerDriver.C

...autoMesh/autoHexMesh/autoHexMeshDriver/autoRefineDriver.C

...DisplacementMeshMover/displacementMeshMoverMotionSolver.C

...DisplacementMeshMover/displacementMeshMoverMotionSolver.H

...rnalDisplacementMeshMover/externalDisplacementMeshMover.C

...rnalDisplacementMeshMover/externalDisplacementMeshMover.H

...xMesh/externalDisplacementMeshMover/medialAxisMeshMover.C

...xMesh/externalDisplacementMeshMover/medialAxisMeshMover.H

...ernalDisplacementMeshMover/medialAxisMeshMoverTemplates.C

...mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinement.C

...mesh/autoMesh/autoHexMesh/meshRefinement/meshRefinement.H

...toMesh/autoHexMesh/meshRefinement/meshRefinementBaffles.C