Fix proxy ids

The proxy/resource ids are generated by the client and so we need to
used them as index in the client resource map instead of making our own
number.
Fix stream disconnect and client-node destroy
Fix gstreamer device provider
Make all sockets non-blocking to avoid errors with bad clients
Advertise the subsystems we monitor and disable the gstreamer monitors.
Implement core properties updates
Make sure we send REMOVE_ID after we are done with the resource.

pinos/client/map.h

@@ -88,6 +88,25 @@ pinos_map_insert_new (PinosMap *map,
   return id;
 }
 
+static inline bool
+pinos_map_insert_at (PinosMap *map,
+                     uint32_t  id,
+                     void     *data)
+{
+  size_t size = pinos_map_get_size (map);
+  PinosMapItem *item;
+
+  if (id > size)
+    return false;
+  else if (id == size)
+    item = pinos_array_add (&map->items, sizeof (PinosMapItem));
+  else
+    item = pinos_map_get_item (map, id);
+
+  item->data = data;
+  return true;
+}
+
 static inline void
 pinos_map_remove (PinosMap *map,
                   uint32_t  id)