Merge remote-tracking branch 'origin/feature/29-timestamp-zu-allen-objekten-hinzufügen' into feature/31-json-import-fuer-testdaten

# Conflicts:
#	lib/data/dao/game_dao.dart
#	lib/data/db/database.g.dart
#	lib/data/db/tables/game_table.dart
#	lib/data/dto/game.dart
#	pubspec.yaml

lib/data/dto/player.dart

@@ -1,10 +1,14 @@
+import 'package:clock/clock.dart';
 import 'package:uuid/uuid.dart';
 
 class Player {
   final String id;
   final String name;
+  final DateTime createdAt;
 
-  Player({String? id, required this.name}) : id = id ?? const Uuid().v4();
+  Player({String? id, DateTime? createdAt, required this.name})
+    : id = id ?? const Uuid().v4(),
+      createdAt = createdAt ?? clock.now();
 
   @override
   String toString() {