While magicians couldn’t make YouTube work for them, newer snappy video apps are enthralling a new generation — Magic: it’s the bane of corporate events, the plague of your cousin’s wedding, and a cringe-inducing staple of rich people’s house parties, and perhaps the most painful thing to witness when it goes wrong. Close-up magicians are oft-mocked members of the wider magic-performing industry, the D-listers compared to the likes…