Type safety improved + objects in Event storage destroyed automatically

1. Operator >> of Event is now type safe, meaning that "event >> pData;" throws if pData is not a pointer to the type of the object in event's storage.
2. Calling event.destroy(pData) to destroy the object in the storage is not required anymore. The object will be destructed automatically when the next object is constructed into the storage.

Library and examples added.

Verified that the examples work.