"I'm an entertainer" says KSI, with zero hint of David Brent parody, as he speaks to FourFourTwo in between bites of Nando's chicken, inside the unassuming boardroom at Dagenham & Redbridge.In the politest way possible, we've just asked him to describe himself, and essentially tell us who he is – it's a valid question, given that certain sections of the Daggers' fanbase might have been forgiven for asking after it was revealed in March that the …