Please add a way to get secondary textures

For some reason you can assign secondary textures, but there doesnt seem to be a clear cut way to get them in runtime. You have to retort to filthy hacks to use the following method:

https://github.com/Unity-Technologi...ommon/ScriptBindings/Sprites.bindings.cs#L108

Please add a way to get a secondary texture by name, either in Sprite or SpriteAtlas. Thanks in advance