clsCookie: Pass values between pages using encrypted cookies

This class is meant to pass multiple values between pages using encrypted cookies.

It can:

- Create a cookie object in memory
- Load the values of a cookie sent back by the browser into the cookie object in memory
- Assign multiple values to the cookie object in memory. Multiple cookie values are sent to the browser at once with names with array syntax.
- Cookie values can be removed from the cookie object in memory and from the browser
- Encryption with Blowfish-CBC algorithm can be used to encrypt all the cookie values sent to the browser. A secret server side encryption key can be used for different cookies objects.
- Assigning values to the cookie object in memory can be done just by creating up a new object property and assign a value to it, taking advantage of PHP5 dynamic object variable assignment __get and __set methods