Merge: lib/gtk: add services from GTK+ 3.10 and rename some core services

Services from v3.10 includes the `HeaderBar` (the large window top bar with custom buttons) and the `Stack` which shows only 1 widget at a time with transition effects. The renamed services use the same name as in C.

Pull-Request: #1809
Reviewed-by: Jean Privat <jean@pryen.org>