#598 - removed custom json deserialization from DatabaseParser_v5

.../deadlocker8/budgetmaster/database/DatabaseParser_v5.java

...ker8/budgetmaster/database/model/v5/BackupAccount_v5.java

...master/database/model/v5/BackupRepeatingEndOption_v5.java

...tmaster/database/model/v5/BackupRepeatingModifier_v5.java

...getmaster/database/model/v5/BackupRepeatingOption_v5.java

...er8/budgetmaster/database/model/v5/BackupTemplate_v5.java

.../budgetmaster/database/model/v5/BackupTransaction_v5.java

...ster/database/model/v5/converter/AccountConverter_v5.java

...se/model/v5/converter/RepeatingEndOptionConverter_v5.java

...ase/model/v5/converter/RepeatingModifierConverter_v5.java

...abase/model/v5/converter/RepeatingOptionConverter_v5.java

...ter/database/model/v5/converter/TemplateConverter_v5.java

.../database/model/v5/converter/TransactionConverter_v5.java

...ocker8/budgetmaster/unit/database/DatabaseParserTest.java

...er8/budgetmaster/unit/database/DatabaseParser_v5Test.java

src/test/resources/DatabaseParser_v5Test.json