STYLE: relocate some friend operations to be global ones

src/OpenFOAM/containers/NamedEnum/NamedEnum.C

src/OpenFOAM/meshes/boundBox/boundBox.H

src/OpenFOAM/meshes/boundBox/boundBoxI.H

src/OpenFOAM/meshes/meshShapes/cell/cellI.H

src/OpenFOAM/meshes/meshShapes/cellModel/cellModel.H

src/OpenFOAM/meshes/meshShapes/cellModel/cellModelI.H

src/OpenFOAM/meshes/meshShapes/edge/edge.H

src/OpenFOAM/meshes/meshShapes/edge/edgeI.H

src/OpenFOAM/meshes/meshShapes/face/face.H

src/OpenFOAM/meshes/meshShapes/face/faceI.H

src/OpenFOAM/meshes/meshShapes/labelledTri/labelledTriI.H

src/OpenFOAM/meshes/meshShapes/triFace/triFace.H

src/OpenFOAM/meshes/meshShapes/triFace/triFaceI.H

src/OpenFOAM/meshes/primitiveShapes/objectHit/objectHit.H

src/OpenFOAM/meshes/primitiveShapes/plane/plane.C

src/OpenFOAM/meshes/primitiveShapes/plane/plane.H

src/OpenFOAM/meshes/treeBoundBox/treeBoundBox.C

src/OpenFOAM/meshes/treeBoundBox/treeBoundBox.H

src/OpenFOAM/meshes/treeBoundBox/treeBoundBoxI.H

src/OpenFOAM/primitives/Pair/Pair.H