minor changes
deleted implementation of InventoryItemRepository methods in InventoryController
check if SportsEquipment already exists in createSportsEquipment in InventoryController
added import java.util.ArrayList in InventoryItemRepository
inputfieldlength
Deprecated constructors, Bookings are displayed
Serialized Rent
removed obsoltete code
minor changes
Replaced InventoryController with repository
BalanceController findByCategorie changed
Merge branch 'fabian' of https://github.com/C0nsultant/swtp-rebuild into fabian