"wait" or loading animation in camera sim setup dialog

[Ron Kramer]

I loaded the SIM and selected a image. I had no idea that it was loading. “load image” went dark and I confinued to use NINA to see the image. It didn’t work and I was confused for a while until I saw the “LOAD IMAGE” button change to “UNLOAD”. Some images (71mb in my case) take a while to load and it would clear up confusion if there was a LOADING animation clock appearing to let ys know that it is “busy” doing the load.