Adding New VLO Textures

[Kneesnap]

Unfortunately, since every single image has a hardcoded piece of data in the game executable, it makes adding new images difficult. I'm pretty sure that this can be done if we re-use texture ids though, and make sure images which share texture ids are not loaded at the same time. Could also have a feature to copy images from another VLO, which would in theory always work well.

[Kneesnap]

This should also include being able to add textures to a remap.