Added some utility-classes to be able to create orders

* Address, which represents an address for a sender
* Box, which represents a box inside an order
* Line, which represents a line inside an order
* Sender, which represents the sender for an order
Cleanup
As the sender and receiver object are the same we will use a single class
and extend both objects from the customer-class.
Cleanup
Test for the seperate classes
A massive amount of objects which will represent the data as objects
Applied PSR-standards