core: Add a few more GIO utility functions

src/libotutil/ot-gio-utils.h

@@ -36,6 +36,8 @@ G_BEGIN_DECLS
 
 GFileType ot_gfile_type_for_mode (guint32 mode);
 
+GFile *ot_gfile_get_child_strconcat (GFile *parent, const char *first, ...) G_GNUC_NULL_TERMINATED;
+
 GFile *ot_gfile_new_for_path (const char *path);
 
 const char *ot_gfile_get_path_cached (GFile *file);
@@ -44,6 +46,15 @@ const char *ot_gfile_get_basename_cached (GFile *file);
 
 gboolean ot_gfile_ensure_directory (GFile *dir, gboolean with_parents, GError **error);
 
+gboolean ot_gfile_rename (GFile          *src,
+                          GFile          *dest,
+                          GCancellable   *cancellable,
+                          GError        **error);
+
+gboolean ot_gfile_unlink (GFile          *path,
+                          GCancellable   *cancellable,
+                          GError        **error);
+
 gboolean ot_gfile_load_contents_utf8 (GFile         *file,
                                       char         **contents_out,
                                       char         **etag_out,