Remove dark edge artifacts + General Improvements + Replace AI artwork

# New stuff /PSD.../Arcade Parts - Added unused custom horn button. Remade sprite inspired on FXT Horn button. /spr_sprani_sumo_fe_cvt_Exst/ - Remake of unknown 5B65E08C_512x256 Main Menu Header BG with "SELECT LICENSE" Text - Remake of unknown 4D38BBB0_1024x256 Main Menu Header BG with "MULTIPLAYER..." Red Text # Improvements - Clarissa Japanese and International sprites from OR2SP Mode UI selector on a collab with @thegreatprophetzarquon - Fix alpha channel and sprite edges, rescale shirt size to match with other Clarissa sprites: spr_sprani_selector_cvt_Exst/ 2DA43E41_1024x1024 - Fix border rendering of some textures: spr_sprani_sumo_fe_cvt_Exst/ ACF61D7C_1024x512 31C58963_512x256 BA0147DA_512x512 75C3586A_512x512 E596B7AC_512x512 - Replace AI artwork sprite with manual work: spr_sprani_sumo_fe_cvt_Exst/ D263B3F1_512x512 8C9E91F8_512x512