quick-settings: validate D-Bus variant types and sanitize SSID

src/controlCenter/widgets/quickSettings/bluetoothProxy.vala

@@ -250,9 +250,12 @@ namespace XimperShellNotificationCenter.Widgets {
                 DBusConnection conn, string ?sender,
                 string path, string iface, string signal,
                 Variant params) {
-            string iface_name;
-            params.get_child (0, "s", out iface_name);
-            if (iface_name == "org.bluez.Device1") {
+            if (params.n_children () == 0) return;
+            Variant child = params.get_child_value (0);
+            if (!child.is_of_type (VariantType.STRING)) {
+                return;
+            }
+            if (child.get_string () == "org.bluez.Device1") {
                 load_devices.begin ();
             }
         }

src/controlCenter/widgets/quickSettings/networkManagerProxy.vala

@@ -171,7 +171,7 @@ namespace XimperShellNotificationCenter.Widgets {
         }
 
         public static string ssid_to_string (uint8[] ssid) {
-            return (string) ssid;
+            return ((string) ssid).make_valid ();
         }
 
         public static string get_signal_icon (uint8 strength) {

src/controlCenter/widgets/quickSettings/tiles/powerProfilesTile.vala

@@ -44,7 +44,8 @@ namespace XimperShellNotificationCenter.Widgets {
             profile_names = {};
             foreach (var profile in proxy.profiles) {
                 Variant ?v = profile.lookup ("Profile");
-                if (v != null) {
+                if (v != null
+                        && v.is_of_type (VariantType.STRING)) {
                     profile_names += v.get_string ();
                 }
             }