LONDON — It started more than five years ago as what appeared to be a fairly simple sex crime case: two women in Sweden came forward to accuse Julian Assange of sexual misconduct.Now the case has mutated into a complicated international drama involving Britain, Sweden, the United States, Ecuador, a host of human rights lawyers and the United Nations.But when the dust settles from an unexpected U.N. working group’s finding Friday that Assange has been unlawfully detained, the painful stalemate is expected to …