Pipe for scripts<->application communication, write UYVY files

Got pipe to work between movie subprocess and main code. We use it to
display progress from the scripts. Write "gstreamer raw" files, that
can be worked with easily from gstreamer.

src/main.c

@@ -914,6 +914,12 @@ notify_movie_progress(void)
 		gtk_button_set_label(GTK_BUTTON(movie), "Rec");
 }
 
+void
+notify_movie_message(gchar *msg)
+{
+	gtk_button_set_label(GTK_BUTTON(movie), msg);
+}
+
 void
 on_movie_clicked(GtkWidget *widget, gpointer user_data)
 {