Add licence identifiers in files

lib/food_entry/enter_food_widget.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/storage/storage.dart';
 import 'package:flutter/material.dart';
 import 'package:calorimeter/food_entry/food_entry_bloc.dart';

lib/food_entry/food_entry_bloc.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:barcode_scan2/barcode_scan2.dart';
 import 'package:calorimeter/food_scan/food_fact_lookup.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';

lib/food_entry/food_entry_widget.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:flutter/material.dart';
 import 'package:calorimeter/food_entry/food_entry_bloc.dart';
 import 'package:calorimeter/utils/row_with_spacers_widget.dart';

lib/food_scan/food_fact_lookup.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'dart:convert';
 import 'dart:developer';
 import 'dart:io';

lib/main.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/food_entry/food_entry_bloc.dart';
 import 'package:calorimeter/perdate/perdate_pageview_controller.dart';
 import 'package:calorimeter/storage/storage.dart';

lib/perdate/entry_list.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/food_entry/enter_food_widget.dart';
 import 'package:calorimeter/food_entry/food_entry_bloc.dart';
 import 'package:calorimeter/food_entry/food_entry_widget.dart';

lib/perdate/perdate_pageview.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'dart:developer';
 
 import 'package:calorimeter/perdate/perdate_pageview_controller.dart';

lib/perdate/perdate_pageview_controller.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'dart:developer';
 
 import 'package:barcode_scan2/barcode_scan2.dart';

lib/perdate/perdate_widget.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/food_entry/food_entry_bloc.dart';
 import 'package:calorimeter/perdate/entry_list.dart';
 import 'package:flutter/material.dart';

lib/storage/storage.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'dart:io';
 
 import 'package:calorimeter/food_entry/food_entry_bloc.dart';

lib/utils/app_drawer.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/utils/settings.dart';
 import 'package:flutter/material.dart';
 

lib/utils/calendar_floating_button.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/utils/date_time_helper.dart';
 import 'package:flutter/material.dart';
 

lib/utils/date_time_helper.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 class DateTimeHelper {
   static DateTime now() {
     return DateTime.now().copyWith(

lib/utils/rectangular_notch_shape.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:flutter/material.dart';
 
 class RectangularNotchShape extends NotchedShape {

lib/utils/row_with_spacers_widget.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:flutter/material.dart';
 
 class RowWidget extends StatelessWidget {

lib/utils/scan_food_floating_button.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:flutter/material.dart';
 
 class ScanFoodFAB extends StatelessWidget {

lib/utils/settings.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:calorimeter/utils/app_drawer.dart';

lib/utils/settings_bloc.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:calorimeter/storage/storage.dart';
 

lib/utils/sum_widget.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:calorimeter/food_entry/food_entry_bloc.dart';

lib/utils/theme_bloc.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/storage/storage.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 

lib/utils/theme_switcher_button.dart

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
 import 'package:calorimeter/utils/theme_bloc.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';