Fixed #139 - Split fxml and controller files into individual packages

src/de/deadlocker8/budgetmaster/logic/utils/Helpers.java

src/de/deadlocker8/budgetmaster/main/Main.java

...deadlocker8/budgetmaster/ui/cells/CategoryBudgetCell.java

src/de/deadlocker8/budgetmaster/ui/cells/CategoryCell.java

src/de/deadlocker8/budgetmaster/ui/cells/PaymentCell.java

src/de/deadlocker8/budgetmaster/ui/colorPick/ColorView.java

...ocker8/budgetmaster/ui/controller/CategoryController.java

...adlocker8/budgetmaster/ui/controller/ChartController.java

...de/deadlocker8/budgetmaster/ui/controller/Controller.java

...er8/budgetmaster/ui/controller/ExportChartController.java

...dlocker8/budgetmaster/ui/controller/FilterController.java

...eadlocker8/budgetmaster/ui/controller/HomeController.java

...adlocker8/budgetmaster/ui/controller/ModalController.java

...er8/budgetmaster/ui/controller/NewCategoryController.java

...ker8/budgetmaster/ui/controller/NewPaymentController.java

...locker8/budgetmaster/ui/controller/PaymentController.java

...dlocker8/budgetmaster/ui/controller/ReportController.java

...ocker8/budgetmaster/ui/controller/SettingsController.java

...r8/budgetmaster/ui/controller/SplashScreenController.java

src/de/deadlocker8/budgetmaster/ui/fxml/CategoryTab.fxml