ENH: refactor/centralize handling of direct and distributed mappers (#2436)

...utilities/parallelProcessing/redistributePar/Make/options

...allelProcessing/redistributePar/parFvFieldReconstructor.C

...rocessing/redistributePar/parFvFieldReconstructorFields.C

src/OpenFOAM/fields/Fields/Field/FieldMapper.H

src/OpenFOAM/fields/Fields/Field/directFieldMapper.H

src/OpenFOAM/fields/Fields/Field/distributedFieldMapper.H

...PatchFields/pointPatchField/directPointPatchFieldMapper.H

...Fields/pointPatchField/distributedPointPatchFieldMapper.H

.../pointPatchFields/pointPatchField/pointPatchFieldMapper.H

...eshes/pointMesh/pointMeshMapper/pointBoundaryMeshMapper.H

...nFOAM/meshes/pointMesh/pointMeshMapper/pointPatchMapper.C

...olyMesh/mapPolyMesh/mapDistribute/mapDistributePolyMesh.C

...olyMesh/mapPolyMesh/mapDistribute/mapDistributePolyMesh.H

src/OpenFOAM/meshes/polyMesh/mapPolyMesh/morphFieldMapper.H

src/finiteArea/faMesh/faMeshMapper/faBoundaryMeshMapper.H

...lds/faPatchFields/faPatchField/directFaPatchFieldMapper.H

...aPatchFields/faPatchField/distributedFaPatchFieldMapper.H

...ea/fields/faPatchFields/faPatchField/faPatchFieldMapper.H

...lds/fvPatchFields/fvPatchField/directFvPatchFieldMapper.H

...vPatchFields/fvPatchField/distributedFvPatchFieldMapper.H