Added some basic classes for a quest manager.

Basically laying out the class framework for the quest system.
Adding the TimedObjective class.

Because timed objectives are different from event drived objectives.
Added a super secret folder.
Adding a basic framework for the quest system.

No actual code. Just a whole bunch of functions and comments. Doesn't do
anything yet.

Still haven't decided how to load them and how to make an example...
hopefully we can do that soon.