(Corrects to remove reference in par 9 to planes flying in missing man formation) By Rujun Shen and Anshuman Daga SINGAPORE, March 29 (Reuters) - Grieving Singaporeans were joined by world leaders on Sunday to pay their final respects to the country's first prime minister, Lee Kuan Yew, as the nation came to a near-halt to honor its "founding father." Tens of thousands of people waving flags braved heavy rain and lined the streets to catch a last glimpse of Lee as his coffin was taken by gun carriage on a 15 km procession through the streets of the country he helped build to his state funeral.