#96 - delete tags that are not referenced

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

...dgetmasterserver/logic/database/DatabaseImportExport.java

...budgetmasterserver/logic/database/DatabaseTagHandler.java

...sterserver/server/tag/match/TagMatchDeleteForPayment.java

...r/server/tag/match/TagMatchDeleteForRepeatingPayment.java

...locker8/budgetmasterserver/server/updater/TagUpdater.java