Implemented simple and basic file downloading

lib/api/marianumcloud/webdav/queries/downloadFile/downloadFile.dart

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+
+import 'package:marianum_mobile/api/apiResponse.dart';
+import 'package:marianum_mobile/api/marianumcloud/webdav/queries/downloadFile/downloadFileParams.dart';
+import 'package:marianum_mobile/api/marianumcloud/webdav/webdavApi.dart';
+
+class DownloadFile extends WebdavApi<DownloadFileParams> {
+  DownloadFileParams params;
+
+  DownloadFile(this.params) : super(params);
+
+  @override
+  Future<ApiResponse> run() async {
+
+    // final file = await File(localPath).create();
+    // Uint8List downloadedFile = await (await WebdavApi.webdav).download(params.webdavPath);
+    // file.writeAsBytesSync(downloadedFile, flush: true, mode: FileMode.write);
+    //
+    // OpenFile.open(localPath);
+    throw UnimplementedError();
+  }
+}

lib/api/marianumcloud/webdav/queries/downloadFile/downloadFileParams.dart

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+import 'package:json_annotation/json_annotation.dart';
+import 'package:marianum_mobile/api/apiParams.dart';
+
+part 'downloadFileParams.g.dart';
+
+@JsonSerializable()
+class DownloadFileParams extends ApiParams {
+  String webdavSourcePath;
+  String localTargetPath;
+  String filename;
+
+  DownloadFileParams(this.webdavSourcePath, this.localTargetPath, this.filename);
+
+  factory DownloadFileParams.fromJson(Map<String, dynamic> json) => _$DownloadFileParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$DownloadFileParamsToJson(this);
+}

lib/api/marianumcloud/webdav/queries/downloadFile/downloadFileParams.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'downloadFileParams.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+DownloadFileParams _$DownloadFileParamsFromJson(Map<String, dynamic> json) =>
+    DownloadFileParams(
+      json['webdavSourcePath'] as String,
+      json['localTargetPath'] as String,
+      json['filename'] as String,
+    );
+
+Map<String, dynamic> _$DownloadFileParamsToJson(DownloadFileParams instance) =>
+    <String, dynamic>{
+      'webdavSourcePath': instance.webdavSourcePath,
+      'localTargetPath': instance.localTargetPath,
+      'filename': instance.filename,
+    };

lib/api/marianumcloud/webdav/queries/downloadFile/downloadFileResponse.dart

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+
+import 'package:json_annotation/json_annotation.dart';
+
+part 'downloadFileResponse.g.dart';
+
+@JsonSerializable()
+class DownloadFileResponse {
+  String path;
+
+  DownloadFileResponse(this.path);
+
+  factory DownloadFileResponse.fromJson(Map<String, dynamic> json) => _$DownloadFileResponseFromJson(json);
+  Map<String, dynamic> toJson() => _$DownloadFileResponseToJson(this);
+}

lib/api/marianumcloud/webdav/queries/downloadFile/downloadFileResponse.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'downloadFileResponse.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+DownloadFileResponse _$DownloadFileResponseFromJson(
+        Map<String, dynamic> json) =>
+    DownloadFileResponse(
+      json['path'] as String,
+    );
+
+Map<String, dynamic> _$DownloadFileResponseToJson(
+        DownloadFileResponse instance) =>
+    <String, dynamic>{
+      'path': instance.path,
+    };