Added inline file download progressbar, handle OpenFile directly and handle errors

lib/api/marianumcloud/webdav/queries/listFiles/cacheableFile.g.dart

@@ -8,9 +8,9 @@ part of 'cacheableFile.dart';
 
 CacheableFile _$CacheableFileFromJson(Map<String, dynamic> json) =>
     CacheableFile(
-      json['path'] as String,
-      json['isDirectory'] as bool,
-      json['name'] as String,
+      path: json['path'] as String,
+      isDirectory: json['isDirectory'] as bool,
+      name: json['name'] as String,
       mimeType: json['mimeType'] as String?,
       size: json['size'] as int?,
       eTag: json['eTag'] as String?,