By Josh Smith SEOUL (Reuters) – North Korea celebrated the 110th anniversary of the birth of late founder Kim Il Sung on Friday with fireworks, a procession, and an evening gala in Pyongyang’s main square, with thousands of people in colourful traditional dress singing and dancing. “The Day of the Sun” is North Korea’s biggest annual public holiday. Kim, who died in 1994, founded the authoritarian regime now led by his grandson, Kim Jong Un. This year’s holiday marks 110 years since Kim Il Sung was born on April 15, 1912, and North Korea typically stages bigger celebrations on every fifth and …