Donald Trump has vowed to run “to be president for all of America” as he took to the stage at the Republican National Convention on Thursday, in what was his first public speech following the failed attempt on his life. “I stand before you this evening with a message of confidence, strength, and hope,” Trump told an ecstatic crowd in Milwaukee, Wisconsin. “Four months from now, we will have an incredible victory, and we will begin the four greatest years in the history of our country.” “Together, we will launch a new era of safety, prosperity and freedom for citizens of every race, religion, c…