Added api for custom timetable events

lib/api/mhsl/customTimetableEvent/update/updateCustomTimetableEvent.dart

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+import 'dart:convert';
+
+import 'package:http/http.dart';
+import 'package:http/http.dart' as http;
+
+import '../../mhslApi.dart';
+import 'updateCustomTimetableEventParams.dart';
+
+class UpdateCustomTimetableEvent extends MhslApi<void> {
+  UpdateCustomTimetableEventParams params;
+
+  UpdateCustomTimetableEvent(this.params) : super('server/timetable/customEvents');
+
+  @override
+  void assemble(String raw) {}
+
+  @override
+  Future<Response>? request(Uri uri) {
+    return http.patch(uri, body: jsonEncode(params.toJson()));
+  }
+
+}

lib/api/mhsl/customTimetableEvent/update/updateCustomTimetableEventParams.dart

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+
+import 'package:json_annotation/json_annotation.dart';
+
+import '../customTimetableEvent.dart';
+
+part 'updateCustomTimetableEventParams.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class UpdateCustomTimetableEventParams {
+  String id;
+  CustomTimetableEvent event;
+
+  UpdateCustomTimetableEventParams(this.id, this.event);
+
+  factory UpdateCustomTimetableEventParams.fromJson(Map<String, dynamic> json) => _$UpdateCustomTimetableEventParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$UpdateCustomTimetableEventParamsToJson(this);
+}

lib/api/mhsl/customTimetableEvent/update/updateCustomTimetableEventParams.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'updateCustomTimetableEventParams.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+UpdateCustomTimetableEventParams _$UpdateCustomTimetableEventParamsFromJson(
+        Map<String, dynamic> json) =>
+    UpdateCustomTimetableEventParams(
+      json['id'] as String,
+      CustomTimetableEvent.fromJson(json['event'] as Map<String, dynamic>),
+    );
+
+Map<String, dynamic> _$UpdateCustomTimetableEventParamsToJson(
+        UpdateCustomTimetableEventParams instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'event': instance.event.toJson(),
+    };