Fixed #19 - allow user to choose database save directory

src/charts/ChartGUIController.java

src/core/Settings.java

src/core/Utils.java

src/userInterface/EditController.java

src/userInterface/InsertTimeController.java

src/userInterface/ProjektFensterController.java

src/userInterface/UserInterfaceController.java

src/userInterface/userInterface.fxml