STYLE: promote ListPolicy to Foam namespace

applications/test/List/Make/files

applications/test/List/Test-List.cxx

src/OpenFOAM/containers/Bits/PackedList/PackedList.H

src/OpenFOAM/containers/Buffers/CircularBufferIO.C

...containers/CompactLists/CompactListList/CompactListList.H

src/OpenFOAM/containers/HashTables/HashSet/HashSet.C

...tainers/IndirectLists/IndirectListBase/IndirectListBase.H

...iners/IndirectLists/IndirectListBase/IndirectListBaseIO.C

src/OpenFOAM/containers/Lists/FixedList/FixedList.H

src/OpenFOAM/containers/Lists/FixedList/FixedListIO.C

src/OpenFOAM/containers/Lists/List/UList.H

src/OpenFOAM/containers/Lists/List/UListIO.C

src/OpenFOAM/containers/Lists/policy/ListPolicy.H

src/OpenFOAM/expressions/value/exprValueFieldTag.C

src/OpenFOAM/expressions/value/exprValueFieldTag.H

src/OpenFOAM/matrices/Matrix/Matrix.H

src/OpenFOAM/primitives/ranges/labelRange/labelRanges.C