Patch for: T27261
Fix for #27261. First patch, not a software engineer, be gentle. The functionality I was looking for was 99% finished. All I had to do:
* Expose existing but hidden properies to user (Did I just touch the UI? >> send_in_the_guards.wav)
* Moved the implicit gpu_verify_repeat() up one function in order to add a call to it in GPU_verify_image()
* Fixed rna_image.c to reload the image on property changes
Attached patch and the fail case blend from the bug report. Fun to play with the new Realtime Settings subpanel and watch the texture respond from "infinitely tiled, who cares if you don't like it that way" to "useable for my purposes."
Open to comment & critique, obviously.