Move List's path enumeration into list.go, position into node.go and sortedNames into sorted.go

sorted.go

@@ -0,0 +1,12 @@
+package fejkdata
+
+import "sort"
+
+func sortedNames[V any](m map[string]V) []string {
+	names := make([]string, 0, len(m))
+	for name := range m {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+	return names
+}