load script after initial registry burst

This makes the logic of installing idle handlers and layout handlers a bit
cleaner and allows us to send wayland request from the script in the future.

src/seat.h

@@ -1,6 +1,7 @@
 #ifndef RIVERGUILE_SEAT_H
 #define RIVERGUILE_SEAT_H
 
+#include <stdbool.h>
 #include <wayland-client.h>
 #include <libguile.h>
 
@@ -24,8 +25,6 @@ struct Idle
 
 struct Seat *seat_create (struct wl_seat *wl_seat, uint32_t name);
 void seat_destroy (struct Seat *seat);
-
-void idle_configure (struct Idle *idle, struct Seat *seat);
-void idle_destroy (struct Idle *idle);
+bool seat_add_idle (struct Seat *seat, SCM proc, uint32_t ms);
 
 #endif