The first teaser trailer for “Rogue One: A Star Wars Story” has dropped, and so in the spirit of our “Force Awakens” teaser breakdown, we’re back to provide frame-by-frame analysis of all 90 seconds. This is the first in a new series of “Star Wars” anthology movies, this one set before and around 1977’s original film. How do you make a period piece about a fictional period? What’s Felicity Jones’s character all about? Why does Forrest Whitaker have a Darth Vader breathing harmonica? And why does Jason refer to all droids like they’re vacuum cleaners? For some questions there are no good answers.