Lena Dunham’s warm, lively adaptation of Karen Cushman’s 1994 historical novel “Catherine Called Birdy,” opens with a needle drop that references another classic teen movie. Misty Miller’s cover of the ’90s Supergrass tune “Alright” plays as a young Lady Catherine (called Birdy) (Bella Ramsey), finds herself in the midst of a mud fight during a raucous cottage raising in her medieval English village. The song choice (one of a few great ‘90s covers that Miller performs throughout the film), is a high-five to Amy Heckerling’s 1995 film “Clueless,” and it inextricably links the two films together…