Merge branch 'feature/rename-spatialparameter-classes' into 'next'

dumux/discretization/upwindscheme.hh

dumux/io/vtkmultiwriter.hh

dumux/material/spatialparams/fv.hh

dumux/material/spatialparams/fv1p.hh

dumux/material/spatialparams/implicit1p.hh

dumux/material/spatialparams/sequentialfv.hh

dumux/material/spatialparams/sequentialfv1p.hh

dumux/porousmediumflow/1p/sequential/properties.hh

dumux/porousmediumflow/1pncmin/implicit/propertydefaults.hh

dumux/porousmediumflow/2p/model.hh

dumux/porousmediumflow/2p/sequential/properties.hh

dumux/porousmediumflow/2p1c/model.hh

dumux/porousmediumflow/2p2c/model.hh

dumux/porousmediumflow/2p2c/sequential/properties.hh

dumux/porousmediumflow/2pnc/model.hh

dumux/porousmediumflow/3p/model.hh

dumux/porousmediumflow/3p3c/model.hh

dumux/porousmediumflow/3pwateroil/propertydefaults.hh

dumux/porousmediumflow/mpnc/implicit/propertydefaults.hh

dumux/porousmediumflow/richards/model.hh