refactor: made WebSocket non-final for reconnect modularity

Server/src/main/java/uulm/teamname/marvelous/server/lobbymanager/Participant.java

@@ -8,7 +8,7 @@ import java.util.Objects;
 public class Participant {
 
     /** The Websocket to contact the participant with */
-    public final WebSocket connection;
+    private WebSocket connection;
 
     /** The type (as in role) of participant */
     public final ParticipantType type;
@@ -23,6 +23,21 @@ public class Participant {
         this.AI = AI;
     }
 
+    /** Returns the {@link WebSocket} to contact the participant with */
+    public WebSocket getConnection() {
+        return connection;
+    }
+
+    /** Sets the connection {@link WebSocket} for the current participant */
+    public void setConnection(WebSocket connection) {
+        this.connection = connection;
+    }
+
+    /** Removes reference to current connection from Participant */
+    public void clearConnection() {
+        this.connection = null;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
@@ -35,4 +50,13 @@ public class Participant {
     public int hashCode() {
         return Objects.hash(connection, type, AI);
     }
+
+    @Override
+    public String toString() {
+        return "Participant{" +
+                "connection=" + connection +
+                ", type=" + type +
+                ", AI=" + AI +
+                '}';
+    }
 }