Added main menu for the user interface.
Removed the serialization / deserialization functions from the impl namespace.
 On branch master
 Changes to be committed:
	modified:   .gitignore
	modified:   bin/Debug/schoolMarkLogger
	new file:   bin/Release/schoolMarkLogger
	modified:   competence.cpp
	modified:   lesson.cpp
	modified:   main.cpp
	modified:   menu.hpp
	modified:   quartal.cpp
	modified:   school_year.cpp
	modified:   serialization.hpp
	modified:   user.cpp
	modified:   user.hpp