big refactoring: classes related to transactions

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

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

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

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

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

...de/deadlocker8/budgetmaster/entities/account/Account.java

.../deadlocker8/budgetmaster/entities/category/Category.java

...in/java/de/deadlocker8/budgetmaster/entities/tag/Tag.java

...e/deadlocker8/budgetmaster/entities/tag/TagScheduler.java

...e/deadlocker8/budgetmaster/repeating/RepeatingOption.java

...8/budgetmaster/repeating/RepeatingTransactionUpdater.java

...deadlocker8/budgetmaster/reports/ReportConfiguration.java

...ker8/budgetmaster/reports/ReportConfigurationBuilder.java

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

.../de/deadlocker8/budgetmaster/services/AccountService.java

...de/deadlocker8/budgetmaster/services/CategoryService.java

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

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

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

.../budgetmaster/services/report/ReportGeneratorService.java