Gen 1: Add support for 1st Gen stereo elements

Move routing src/snk creation into alsa.c from window-routing.c.
Move port_category and port_num from struct routing_snk to struct
alsa_elem.
Handle ALSA elements with two values.
Handle controls labelled as 1L and 1R instead of 1 and 2.

src/alsa-sim.c

@@ -508,5 +508,8 @@ void create_sim_from_file(GtkWindow *w, char *fn) {
 
   snd_config_delete(config);
 
+  alsa_set_lr_nums(card);
+  alsa_get_routing_controls(card);
+
   create_card_window(card);
 }