[rawfile] move RRawFile from Detail to Internal namespace

etc/plugins/ROOT@@Internal@@RRawFile/P010_RRawFileDavix.C

io/io/inc/LinkDef.h

io/io/inc/ROOT/RRawFile.hxx

io/io/inc/ROOT/RRawFileUnix.hxx

io/io/inc/ROOT/RRawFileWin.hxx

io/io/src/RRawFile.cxx

io/io/src/RRawFileUnix.cxx

io/io/src/RRawFileWin.cxx

io/io/test/RRawFile.cxx

net/davix/inc/LinkDef.h

net/davix/inc/ROOT/RRawFileDavix.hxx

net/davix/src/RRawFileDavix.cxx

net/davix/test/RRawFileDavix.cxx

tree/ntuple/v7/inc/ROOT/RMiniFile.hxx

tree/ntuple/v7/inc/ROOT/RPageStorageFile.hxx

tree/ntuple/v7/src/RMiniFile.cxx

tree/ntuple/v7/src/RPageStorageFile.cxx

tree/ntuple/v7/test/ntuple_minifile.cxx