GPU: Add a Force Progressive Scan option (disable interlacing)

src/core/settings.h

@@ -21,6 +21,7 @@ struct Settings
   mutable u32 max_gpu_resolution_scale = 1;
   bool gpu_true_color = false;
   bool gpu_texture_filtering = false;
+  bool gpu_force_progressive_scan = false;
   bool display_linear_filtering = true;
   bool display_fullscreen = false;