Debug mode for SpriteEngine
Debug mode for SpriteEngine

Outputs the assembled sheet, for manual verification. Compile in by
uncommenting the ifdef.

Change-Id: Ia21d008cf1fd5ff0a551409f75683599cbb465a1
Reviewed-by: Martin Jones <d1da02505c7f228af82a23235becb435f45569f5@nokia.com>

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