/// <summary>
        /// Load a XamlPackage into Memory
        /// </summary>
        /// <param name="filename">Suggested Extension: .xpkg</param>
        /// <returns></returns>
        public static Package Load(string filename)
        {
            var ret = new Package();

            using(var z = new ZipFile(filename))
            {
                var metaSr = new StreamReader((from e in z.Entries where e.FileName == "meta.xaml" select e).ToArray()[0].OpenReader());
                ret.Meta = (Dictionary<string, object>)XamlServices.Parse(metaSr.ReadToEnd());

                var contentEntries = (from e in z.Entries where (e.IsDirectory == false && e.FileName.StartsWith("content/")) select e).ToArray();
                foreach (var item in contentEntries)
                {
                    var sr = new StreamReader(item.OpenReader());
                    ret.AddXaml(item.FileName.Substring("content/".Length), sr.ReadToEnd());
                }
            }

            return ret;
        }
        /// <summary>
        /// Save a Package in to Filesystem
        /// </summary>
        /// <param name="filename">Suggested Extension: .xpkg</param>
        /// <param name="pkg">The saving Package</param>
        public static void Save(string filename, Package pkg)
        {
            using(var z = new ZipFile())
            {
                var content = z.AddDirectoryByName("content");
                var res = z.AddDirectoryByName("res");

                foreach (var r in pkg.XamlFiles)
                {
                    z.AddEntry($"content/{r.Key}", r.Value);
                }
                foreach (var r in pkg.Ressources)
                {
                    z.AddEntry($"res/{r.Key}", r.Value);
                }

                z.AddEntry("meta.xaml", XamlServices.Save(pkg.Meta));

                z.Save(filename);
            }
        }