feat(websocket)!: Implement WebSocket connection and event handling

knockoutwhistweb/app/logic/user/SessionManager.scala

@@ -6,9 +6,11 @@ import model.users.User
 
 @ImplementedBy(classOf[BaseSessionManager])
 trait SessionManager {
-  
+
   def createSession(user: User): String
+
   def getUserBySession(sessionId: String): Option[User]
+
   def invalidateSession(sessionId: String): Unit
 
 }

knockoutwhistweb/app/logic/user/UserManager.scala

@@ -8,9 +8,13 @@ import model.users.User
 trait UserManager {
 
   def addUser(name: String, password: String): Boolean
+
   def authenticate(name: String, password: String): Option[User]
+
   def userExists(name: String): Option[User]
+
   def userExistsById(id: Long): Option[User]
+
   def removeUser(name: String): Boolean
 
 }

knockoutwhistweb/app/logic/user/impl/StubUserManager.scala

@@ -9,7 +9,7 @@ import javax.inject.{Inject, Singleton}
 
 @Singleton
 class StubUserManager @Inject()(val config: Config) extends UserManager {
-  
+
   private val user: Map[String, User] = Map(
     "Janis" -> User(
       internalId = 1L,
@@ -53,5 +53,5 @@ class StubUserManager @Inject()(val config: Config) extends UserManager {
   override def removeUser(name: String): Boolean = {
     throw new NotImplementedError("StubUserManager.removeUser is not implemented")
   }
-  
+
 }