Desktop: correct get_game_info.
GameInfo: the system entry is now a System, genres is now an attribute with accessors (instead of a property).
GameData, GameInfo & MegaDrive: handle the release date.
Replaced the XML countries file by a new JSON one.
Library: inherit directly from Object.
Added some country and version analysing capabilities.
Can now guess the current country.
Game now haves a region too.
MegaDrive: now has a Mega Drive cartridge as the fallback icon.