Generic fixes (#1716)

* reset brightness after using

* set default qr to auto detect

* minor safety enhancement

* close socket after checking connectivity

* fix incorrect parent exception class

* pump medium and fast priorities even if they are equal to slow

* Add Ton to exchange

* fix silent payments
add Seth bitcoin node

* deselect quantex
add seth node for existing users

* fix node uri

lib/src/screens/receive/widgets/qr_image.dart

@@ -23,7 +23,7 @@ class QrImage extends StatelessWidget {
     return qr.QrImageView(
       data: data,
       errorCorrectionLevel: errorCorrectionLevel,
-      version: version ?? 9, // Previous value: 7 something happened after flutter upgrade monero wallets addresses are longer than ver. 7 ???
+      version: version ?? qr.QrVersions.auto,
       size: size,
       foregroundColor: foregroundColor,
       backgroundColor: backgroundColor,