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

knockoutwhistweb/app/util/mapper/ReceivedHandEventMapper.scala

@@ -0,0 +1,16 @@
+package util.mapper
+
+import de.knockoutwhist.events.player.ReceivedHandEvent
+import play.api.libs.json.{JsArray, JsObject, Json}
+import util.WebUIUtils
+
+object ReceivedHandEventMapper extends SimpleEventMapper[ReceivedHandEvent] {
+
+  override def id: String = "ReceivedHandEvent"
+  override def toJson(event: ReceivedHandEvent): JsObject = {
+    Json.obj(
+      "dog" -> event.player.isInDogLife,
+      "hand" -> event.player.currentHand().map(hand => WebUIUtils.handToJson(hand))
+    )
+  }
+}

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
+
+}