An offset style attribute is now exposed publicly as an NSValue representing a CGVector instead of an NSArray of NSNumbers. A padding style attribute is now exposed publicly as an NSValue representing an NSEdgeInsets or UIEdgeInsets instead of an NSArray of NSNumbers. This change also fixes round-tripping of padding values due to a difference between the style specification and Foundation regarding the order of edges around a box. Used a designated initializer on NSEdgeInsets/UIEdgeInsets to ensure correct order when converting from C++ to Objective-C.
Fixes#5947, fixes#6065.
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