Add support NSValue structs in valueAsText injections

[alexgarbarev]

I think we can add support of values with next string representations:
CGSize(50.0, 30.0)
or
NSRange(0, 20)
I suggest to implement it via post-processor, replace all NSValue structures strings with NSValue objects and replace injection by withObject injection.

[jasperblues]

👍

This would be useful in the block-style. . . and for folks who prefer the XML style, not just useful but essential.