+void savedata_file_read( savedata_file *file );
+void savedata_file_write( savedata_file *file );
+void savedata_group_write( savedata_group *group );
+int skaterift_autosave(int async);
+void skaterift_autosave_synchronous(void);
+void skaterift_autosave_update(void);
+void skaterift_read_addon_alias( vg_msg *msg, const char *key,
+ enum addon_type type,
+ addon_alias *alias );