SEASON PREMIERE: Season 5 of this increasingly assured sketch series begins tonight, and Jordan Peele and Keegan-Michael Key are as thoughtful, daring and funny as ever. The only difference, this season, is one of format: No more appearances before a live audience to introduce sketches. And that’s a good change, because these two, like the repertory company of SCTV, shine most when they disappear into their wildly diverse characters. And this season, we not only get Barack Obama’s “Anger Translator,” but one for Hillary Clinton as well.