“Me and My Girl” is a fizzy, frothy, and funny British musical from the 1930s, updated in the 1980s, presented with period pizzazz as part of City Center’s Encores! concert series.  With a fancifully simple story and charming, if forgettable score, this show offers pure lighthearted escapism.  If you’re looking to think, skip it, otherwise, serious musical theatre fans should catch this chance to see a classic.