Renamed all Timer named things to TimeProgress

Signed-off-by: Andreas Fahrecker <AndreasFahrecker@gmail.com>

lib/persistence/time_progress_entity.dart

@@ -0,0 +1,36 @@
+class TimeProgressEntity {
+  final String id;
+  final DateTime startTime;
+  final DateTime endTime;
+
+  TimeProgressEntity(this.id, this.startTime, this.endTime);
+
+  @override
+  int get hashCode => id.hashCode ^ startTime.hashCode ^ endTime.hashCode;
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is TimeProgressEntity &&
+          runtimeType == other.runtimeType &&
+          id == other.id &&
+          startTime == other.startTime &&
+          endTime == other.endTime;
+
+  Map<String, Object> toJson() {
+    return {
+      "id": id,
+      "startTime": startTime.millisecondsSinceEpoch,
+      "endTime": startTime.millisecondsSinceEpoch
+    };
+  }
+
+  static TimeProgressEntity fromJson(Map<String, Object> json) {
+    final String id = json["id"] as String;
+    final DateTime startTime =
+        DateTime.fromMillisecondsSinceEpoch(json["startTime"] as int);
+    final DateTime endTime =
+        DateTime.fromMillisecondsSinceEpoch(json["endTime"] as int);
+    return TimeProgressEntity(id, startTime, endTime);
+  }
+}