Retrieves information about an available shapeshift form or similar ability.
icon, active, castable, spellID = GetShapeshiftFormInfo(index);
- number - index, ascending from 1 to GetNumShapeshiftForms()
- string - Path to icon texture
- boolean - 1 if this shapeshift is currently active, nil otherwise
- boolean - 1 if this shapeshift form may be entered, nil otherwise
- number - ID of the spell that activates this ability
- As well as druid shapeshifting, warrior stances, paladin auras, hunter aspects, death knight presences, and shadowform use this API.