Ok, this commit will change rsiwidget in a few ways. When there is no image found in the folder, it will gray out as in the kde logout sequence. Next to that, some artifacts seem to have been solved by these changes....

Todo:
- place the counter in a box, maybe use the rsipopup for it
- make this behaviour configurable, next to the images.
- make this behaviour the default setting.

Please check for regressions and other issues.

CCBUG: 128780
I can not support transparant images as part of your image collection, but the aim is the title of the bugreport ;-)