Istanbul is a bright and buzzy city where spice markets explode with color and streets vibrate with activity. Despite having centuries of history on its shoulders, the megapolis never stops moving forward. This year has seen the inauguration of the new home for the city’s blockbuster modern museum and a flurry of hotel openings. Here’s how to stay on-trend in Turkey’s majestic, melting-pot megacity. Delve into Istanbul’s vintage shops If you need a wardrobe makeover, head to the so-called ‘Soho…