ftcli names: added the clean-nametable subcommand to delete all namerecords

ftcli os2table: added the --set-wws / --unset-wws argument to set or clear OS/2.fsSelection bit 8

ftcli assistant recalc-names: if the --old-full-font-name argument is used, old style Full Font Name (==PostScript Name) is written only in the Windows table