Wearing rainbow-colored shirts, socks, pants and even hair, people of all ages moved easily on a breezy Saturday afternoon through Martinez’s Waterfront Park, which was decorated for the Fourth annual Pride in Martinez. More than 50 organizations set up tables in the park on the banks of the Carquinez Strait. Artists and artisans sold handmade art and jewelry. Food trucks dished up pizza and quesabirria tacos, the seasoned aroma filling the air. And ice cream vendors walked the perimeter, ringing…