Casino mogul Steve Wynn on Thursday evening told a gathering of more than 2,000 real estate developers and other professionals that he is confident his planned casino on the waterfront in Everett will became a major economic engine in Massachusetts, while also taking the opportunity to gently chide those who could slow him down. Wynn spend most of his twenty-minute speech reminiscing about his family roots – both his parents were from Revere – and promoting his plans to build a $1.75 billion casino resort.