Update ISO 3166 Entities spreadsheet

Update the spreadsheet to the latest version of ISO 3166-1 Country
Codes, add various extra data fields for other code systems (IDD, IMO,
etc), and add various name forms including from iso-codes.

This is preparation for a move to an xml file format to support the
Country Codes in KDE which will split the l10n files into separate files
for code data, name translations, and locale settings. This should
improve our Codes support while decreasing the installed runtime
footprint.

M +- -- l10n/entities.ods