feat(api): Implement received hand event handling and UI updates

knockoutwhistweb/app/util/mapper/SimpleEventMapper.scala

@@ -0,0 +1,11 @@
+package util.mapper
+
+import de.knockoutwhist.utils.events.SimpleEvent
+import play.api.libs.json.JsObject
+
+trait SimpleEventMapper[T <: SimpleEvent] {
+  
+  def id: String
+  def toJson(event: T): JsObject
+
+}