Get ready: It’s the 250th anniversary of the Revolutionary War

This month sees the official launch of the Revolutionary War commemorations — the beginning of a year-and-a-half-long celebration leading up to next year’s Semiquincentennial. And the (mostly friendly) competition to salute this once-in-a-generation milestone is already heading up — including here in New York City where a nautical-themed spectacle will arrive next year. Majestically-masted tall…