Merge branch '22-waiting-for-players' into 'main'

android/src/com/wordbattle/game/AndroidInterfaceClass.java

android/src/com/wordbattle/game/AndroidLauncher.java

core/src/com/wordbattle/game/WordBattle.java

...wordbattle/game/controller/ConnectingLobbyController.java

.../com/wordbattle/game/controller/CreateGameController.java

...ordbattle/game/controller/FinalLeaderBoardController.java

...c/com/wordbattle/game/controller/HowToPlayController.java

...com/wordbattle/game/controller/LeaderBoardController.java

core/src/com/wordbattle/game/controller/LobbyController.java

...rc/com/wordbattle/game/controller/MainMenuController.java

core/src/com/wordbattle/game/controller/StartController.java

...om/wordbattle/game/controller/WaitingLobbyController.java

core/src/com/wordbattle/game/model/LobbyModel.java

core/src/com/wordbattle/game/network/FirebaseInterface.java

core/src/com/wordbattle/game/network/FirebaseManager.java

core/src/com/wordbattle/game/states/CreateGameState.java

core/src/com/wordbattle/game/states/HowToPlayState.java

core/src/com/wordbattle/game/states/LobbyState.java

core/src/com/wordbattle/game/states/MainMenuState.java

core/src/com/wordbattle/game/view/HowToPlayView.java