Leave-button, cLobbyLeave uses playerId, server lobby hasStarted boolean++

...t/core/src/com/mygdx/game/controllers/GameController.java

...core/src/com/mygdx/game/controllers/PlayerController.java

CheckersClient/core/src/com/mygdx/game/controllers/Utils.kt

.../src/com/mygdx/game/controllers/commands/cLobbyLeave.java

CheckersClient/core/src/com/mygdx/game/model/Game.kt

CheckersClient/core/src/com/mygdx/game/model/GameMode.kt

CheckersClient/core/src/com/mygdx/game/model/Lobby.java

CheckersClient/core/src/com/mygdx/game/views/MenuView.java

CheckersClient/core/src/com/mygdx/game/views/PlayView.java

...lient/core/src/com/mygdx/game/views/tokens/StarPiece.java

...core/src/com/mygdx/game/controller/NetworkController.java

...src/com/mygdx/game/controller/commands/cLobbyGetList.java

...e/src/com/mygdx/game/controller/commands/cLobbyLeave.java

...c/com/mygdx/game/controller/commands/cSetPlayerReady.java

...re/src/com/mygdx/game/controller/commands/cStartGame.java

CheckersServer/core/src/com/mygdx/game/model/Lobby.java