BEST1 and Best vitelliform macular dystrophy: 2.1. Assigning Best Vitelliform Macular Dystrophy (BD)-, Autosomal Dominant Vitreoretinochoroidopathy (ADVIRC)-, and Autosomal Recessive Bestrophinopathy (ARB)-Associated Mutations to the BEST1 Chicken Three-Dimensional (3D) Crystal Structure