To wrap (verb): to wind or encircle something around another thing, so as to cover it or tie it. Eg. “Wrap the presents for Christmas” or “Wrap the string around your finger”. Wrap up: a phrasal verb using ‘wrap’, meaning to cover or enclose something inside some soft material (for example paper or clothing) "I wrapped up Christmas presents for my children” or “wrap up, it’s cold outside” (wrap yourself in your clothes). So in this case it is a metaphor, and means ‘all brought together’ (as though it was wrapped up like a gift).

"all wrapped in" = "within" (It's an elegant way of saying something very simple)