7 merge requests!21Add Javadoc to GeneralBudget, and reworked method addBudget,!16Item, Income and Expense now use ObjectProperty for date and for Expense- and IncomeCategory,!15Implemented ObjectProperty for variable in Item, Income and in Expense class.,!14Item made variable date use LocalDate, and all other files support this change,!13Item changed object-variable date to use LocalDate, and made all other classes support this,!12Reworked Item class and Filehandling class, and made methods.,!10Improved and simplified code in FileHandling class