Retrieves a random talent from a group of talents that a creature possesses.
The creature who potentially possesses a talent within the specified talent category. (Default: OBJECT_SELF)
Returns a random talent of oCreature, within nCategory.
It is possible for nCreature not to have any talent within the specified nCategory. In this case this function will return an invalid talent, akin to OBJECT_INVALID, but you must use the GetIsTalentValid() to test this.
Specifying nCategory 1 actually returns talents of category 11 and vice versa.
Returns invalid talent if the creature is immobilized (toolset speed setting, entangle effect or cutscene immobility).
If category = 0, returns anything without category, known feats (but not with 0 uses) and skills
author: Tom Cassiotis, editor: Charles Feduke, additional contributor(s): Jim Allen