From Native Americans to gun-slinging gamblers to visitors from around the world, Hanging Lake, with its turquoise waters and waterfalls, has rested high in Glenwood Canyon for centuries. Now, after years of uncertainty, restoration work has positioned the world-famous trail to endure for generations to come. Dozens gathered Thursday morning at the Hanging Lake trailhead to celebrate the completion of a multi-year, $4.9 million restoration proje…