AUSER2: Manage user sessions stored in file using cookies

This class can manage user sessions stored in file using cookies.

It takes the user details like user name and password and creates a session file and a cookie value with the hash of the user name and password.

The class can also check if the user was previously logged checking the session cookie and the session file, get the logged user data, and end the user session deleting the session file and the cookie value.