Method overloads for `Texture::Load` to automatically unload textures

[lucas-watkins]

Hello, I apologize if I am misunderstanding something. It seems that when you call .Load on a texture the previous texture is not unloaded and instead potentially leads to a resource leak unless you call .Unload before. Would it be a good feature to provide overloads for Texture class that automatically unload the texture when you call .Load to prevent this?

[RobLoach]

I think it would make sense to call Unload prior to Load in the Texture class itself. Feel free to send a PR

[lucas-watkins]

Thanks, will do