added more stuff to server

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

...ore/src/com/mygdx/game/controllers/NetworkController.java

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

...core/src/com/mygdx/game/controllers/commands/Command.java

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

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

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

.../libraries/Gradle__CheckersServer_desktop_desktop_1_0.xml

CheckersServer/.idea/modules.xml

CheckersServer/core/src/com/mygdx/game/Constants.java

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

.../core/src/com/mygdx/game/controller/commands/Command.java

.../com/mygdx/game/controller/commands/cPlayerPieceMove.java

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

CheckersServer/core/src/com/mygdx/game/model/Field.kt

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

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

CheckersServer/core/src/com/mygdx/game/model/GameState.kt

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

CheckersServer/core/src/com/mygdx/game/model/Piece.kt