Change from fontawesome to tabler icons (#516)

* Change from fontawesome to tabler icons

- Consistent with the frontend

* Cleanup conflicts

* Use double quotes

* remove unused import

* Update release notes

* Migrate some google icons to tabler icons

* Icon update

* Properly support display of custom icons

* Fix lookup

lib/barcode/purchase_order.dart

@@ -1,6 +1,5 @@
 import "package:flutter/material.dart";
-
-import "package:font_awesome_flutter/font_awesome_flutter.dart";
+import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
 import "package:one_context/one_context.dart";
 
 import "package:inventree/l10.dart";
@@ -106,7 +105,7 @@ class POReceiveBarcodeHandler extends BarcodeHandler {
         receive_url,
         fields,
         method: "POST",
-        icon: FontAwesomeIcons.rightToBracket,
+        icon: TablerIcons.transition_right,
         onSuccess: (data) async {
           showSnackIcon(L10().receivedItem, success: true);
         }