big refactoring: classes related to categories

...java/de/deadlocker8/budgetmaster/categories/Category.java

...adlocker8/budgetmaster/categories/CategoryController.java

...adlocker8/budgetmaster/categories/CategoryRepository.java

.../deadlocker8/budgetmaster/categories/CategoryService.java

.../de/deadlocker8/budgetmaster/categories/CategoryType.java

...eadlocker8/budgetmaster/categories/CategoryValidator.java

...deadlocker8/budgetmaster/controller/FilterController.java

...deadlocker8/budgetmaster/controller/ReportController.java

...adlocker8/budgetmaster/controller/SettingsController.java

...n/java/de/deadlocker8/budgetmaster/database/Database.java

.../de/deadlocker8/budgetmaster/database/DatabaseParser.java

.../deadlocker8/budgetmaster/database/DatabaseParser_v3.java

...eadlocker8/budgetmaster/database/legacy/LegacyParser.java

...8/budgetmaster/reports/categoryBudget/CategoryBudget.java

...tmaster/reports/categoryBudget/CategoryBudgetHandler.java

...de/deadlocker8/budgetmaster/services/DatabaseService.java

...adlocker8/budgetmaster/services/FilterHelpersService.java

.../de/deadlocker8/budgetmaster/services/HelpersService.java

...a/de/deadlocker8/budgetmaster/services/ImportService.java

...de/deadlocker8/budgetmaster/transactions/Transaction.java