Made GradeAverage persistent

lib/storage/gradeAverages/gradeAveragesSettings.g.dart

@@ -0,0 +1,21 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'gradeAveragesSettings.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+GradeAveragesSettings _$GradeAveragesSettingsFromJson(
+        Map<String, dynamic> json) =>
+    GradeAveragesSettings(
+      useGradeSystem: json['useGradeSystem'] as bool,
+      inputs: (json['inputs'] as List<dynamic>).map((e) => e as int).toList(),
+    );
+
+Map<String, dynamic> _$GradeAveragesSettingsToJson(
+        GradeAveragesSettings instance) =>
+    <String, dynamic>{
+      'useGradeSystem': instance.useGradeSystem,
+      'inputs': instance.inputs,
+    };