There’s a moment in Matthew López’s epic, two-part, nearly seven-hour play “The Inheritance” in which the novelist E.M. Forster tells a group of young gay New Yorkers living in the 2010s, “I’ve had my time. Now it’s yours.” The fact that it’s writer, director and actor Daniel MacIvor speaking this line in Canadian Stage’s new production of the play — which opens next week — has a wonderful meta-theatrical significance to it. MacIvor, along with figures like Sky Gilbert, Brad Fraser and the late Ken McDougall, is one of the pioneering queer theatre artists who emerged in this country in the 1980s and ’90s.