Add Google calendar API and workspace sync

lib/main.dart

@@ -3,11 +3,11 @@ import 'dart:io';
 import 'dart:async';
 import 'dart:math' as math;
 
-import 'package:device_calendar/device_calendar.dart' as device_calendar;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:geocoding/geocoding.dart' as geocoding;
 import 'package:geolocator/geolocator.dart';
+import 'package:google_sign_in/google_sign_in.dart';
 import 'package:http/http.dart' as http;
 import 'package:mobile_scanner/mobile_scanner.dart';
 import 'package:path_provider/path_provider.dart';
@@ -17,6 +17,7 @@ part 'data.dart';
 part 'app_shell.dart';
 part 'calendar_widgets.dart';
 part 'pages.dart';
+part 'google_calendar_page.dart';
 part 'dialogs.dart';
 part 'utils.dart';