refactor: sort imports

app/lib/consts.dart

+import 'package:latlong2/latlong.dart';
 import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
-import 'package:latlong2/latlong.dart';
 
 // API variables
 const String port = "8443";

app/lib/main.dart

-import 'package:flutter/material.dart';
 import 'pages/default_page.dart';
+import 'package:flutter/material.dart';
 
 void main() {
   runApp(const MyApp());

app/lib/server_requests/fetch_markers.dart

+import 'dart:io';
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
-import '../../consts.dart';
-import '../data_classes.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
-import 'package:flutter/material.dart';
+
+import '../../consts.dart';
+import '../data_classes.dart';
 
 class FetchResult {
   final List<Measurement> measurements;

app/lib/server_requests/fetch_relation.dart

+import 'dart:io';
 import 'dart:async';
 import 'dart:convert';
-import 'dart:io';
 import 'dart:typed_data';
 import 'package:path_provider/path_provider.dart';
 

app/lib/widgets/choropleth_map.dart

+import 'dart:math';
 import 'dart:typed_data';
-import '../data_classes.dart';
 import 'package:flutter/material.dart';
 import 'package:syncfusion_flutter_maps/maps.dart';
-import 'dart:math';
-import 'dart:convert';
+
+import '../data_classes.dart';
 
 /// A class containing thickness data for each subdivision of the map.
 class IceThicknessModel {

app/lib/widgets/map_widget.dart

-import 'package:flutter/material.dart';
-import '../data_classes.dart';
-import '../../consts.dart';
-import 'quick_view_chart.dart';
-import 'stat_charts.dart';
-import 'sat_layer.dart';
-import 'package:flutter_map/flutter_map.dart';
-import 'choropleth_map.dart';
 import 'dart:typed_data';
+import 'package:flutter_map/flutter_map.dart';
+import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
+import 'sat_layer.dart';
+import 'stat_charts.dart';
+import '../../consts.dart';
+import 'choropleth_map.dart';
+import '../data_classes.dart';
+import 'quick_view_chart.dart';
+
 /// MapContainerWidget is the main widget that contains the map with all
 /// its layers, polygons and markers.
 class MapContainerWidget extends StatefulWidget {

app/lib/widgets/osm_map.dart

 import 'package:flutter/material.dart';
-import '../data_classes.dart';
-import '../../consts.dart';
 import 'package:flutter_map/flutter_map.dart';
-import 'package:latlong2/latlong.dart';
+
+import '../../consts.dart';
+import '../data_classes.dart';
 
 class OSMmap extends StatelessWidget {
   final List<Measurement> markerList;

app/lib/widgets/sat_layer.dart

+import 'package:latlong2/latlong.dart';
 import 'package:flutter/material.dart';
-import '../data_classes.dart';
 import 'package:flutter_map/flutter_map.dart';
-import 'package:latlong2/latlong.dart';
+
+import '../data_classes.dart';
 
 class SatLayer extends StatelessWidget {
   final List<Measurement> markerList;