#598 - moved converters to top level package

...dgetmaster/database/model/converter/AccountConverter.java

...getmaster/database/model/converter/CategoryConverter.java

...budgetmaster/database/model/converter/ChartConverter.java

...budgetmaster/database/model/converter/ImageConverter.java

...database/model/converter/RepeatingEndOptionConverter.java

.../database/model/converter/RepeatingModifierConverter.java

...er/database/model/converter/RepeatingOptionConverter.java

...8/budgetmaster/database/model/converter/TagConverter.java

...getmaster/database/model/converter/TemplateConverter.java

...master/database/model/converter/TransactionConverter.java

...er8/budgetmaster/database/model/v6/BackupDatabase_v6.java