added sync at start of round and trick

wizard-common/src/main/java/eu/jonahbauer/wizard/common/messages/observer/TimeoutMessage.java

@@ -1,4 +1,7 @@
 package eu.jonahbauer.wizard.common.messages.observer;
 
+/**
+ * A {@link TimeoutMessage} is sent when an user input times out.
+ */
 public final class TimeoutMessage extends ObserverMessage {
 }

wizard-common/src/main/java/eu/jonahbauer/wizard/common/messages/observer/UserInputMessage.java

@@ -58,6 +58,7 @@ public final class UserInputMessage extends ObserverMessage {
          * An action that indicates that a player should pick a trump suit. A {@link UserInputMessage} with this
          * {@link UserInputMessage#getAction()} should be responded to with a {@link PickTrumpMessage}.
          */
-        PICK_TRUMP
+        PICK_TRUMP,
+        SYNC
     }
 }

wizard-common/src/main/java/eu/jonahbauer/wizard/common/messages/player/ContinueMessage.java

@@ -0,0 +1,4 @@
+package eu.jonahbauer.wizard.common.messages.player;
+
+public final class ContinueMessage extends PlayerMessage {
+}

wizard-common/src/main/java/eu/jonahbauer/wizard/common/messages/player/PlayerMessage.java

@@ -7,7 +7,7 @@ import eu.jonahbauer.wizard.common.util.SealedClassTypeAdapterFactory;
 import lombok.EqualsAndHashCode;
 
 @EqualsAndHashCode
-public abstract sealed class PlayerMessage permits JuggleMessage, PickTrumpMessage, PlayCardMessage, PredictMessage {
+public abstract sealed class PlayerMessage permits ContinueMessage, JuggleMessage, PickTrumpMessage, PlayCardMessage, PredictMessage {
     private static final Gson GSON = new GsonBuilder()
             .registerTypeAdapterFactory(SealedClassTypeAdapterFactory.of(PlayerMessage.class, "Message"))
             .create();