#178 - improved class structure for repeating options; added repeating options to database

...in/java/de/deadlocker8/budgetmaster/entities/Payment.java

...eadlocker8/budgetmaster/entities/RepeatingDefinition.java

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

...ocker8/budgetmaster/repeating/endoption/RepeatingEnd.java

...etmaster/repeating/endoption/RepeatingEndAfterXTimes.java

...r8/budgetmaster/repeating/endoption/RepeatingEndDate.java

...8/budgetmaster/repeating/endoption/RepeatingEndNever.java

...r8/budgetmaster/repeating/modifier/RepeatingModifier.java

...udgetmaster/repeating/modifier/RepeatingModifierDays.java

...getmaster/repeating/modifier/RepeatingModifierMonths.java

...dgetmaster/repeating/modifier/RepeatingModifierYears.java