Removed few references from header file
+ Added header and class for rare cars with inheritance of Car class
+ Added header and class realisation for new cars class
+ Added header and class realisation for used cars
+ Added Service class and header to serialize objects
+ Added functionality to save cars in file
+ Implemented function to find car through collection
+ Added whole functionality to find cars by all fields
+ Added implementation of WriterService and created empty ReaderService
+ Added reader service to read data from files for each car in database. Not implemented yet...
+ Added functionality to update records
+ Added functionality to edit records
Fixed some bugs