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4d2567eb - Powerpoint: ensure that all shape types are presented to the user in speech and braille.

Powerpoint: ensure that all shape types are presented to the user in speech and braille. This Includes mapping media shapes to audio and video roles, and for all other shapes, exposing localizable label as role text, keeping the actual role still as shape. For action button shapes, the action is now exposed via the name property. We also no longer expose the programmatic name of the shape, as this was usually wrong and was only done in the past as a hope of giving some guess as to the shape type.