Refactor codebase resolving warnings and remove self-package imports

lib/api/webuntis/queries/authenticate/authenticate.dart

@@ -2,9 +2,9 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:developer';
 
-import 'package:marianum_mobile/api/webuntis/webuntisApi.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
+import '../../webuntisApi.dart';
 import 'authenticateParams.dart';
 import 'authenticateResponse.dart';
 

lib/api/webuntis/queries/authenticate/authenticateParams.dart

@@ -1,5 +1,6 @@
 import 'package:json_annotation/json_annotation.dart';
-import 'package:marianum_mobile/api/apiParams.dart';
+
+import '../../../apiParams.dart';
 
 part 'authenticateParams.g.dart';
 

lib/api/webuntis/queries/authenticate/authenticateResponse.dart

@@ -1,5 +1,6 @@
 import 'package:json_annotation/json_annotation.dart';
-import 'package:marianum_mobile/api/apiResponse.dart';
+
+import '../../../apiResponse.dart';
 
 part 'authenticateResponse.g.dart';