[Feature request] x 2 - Allow window image replacement and overlay of two blinds

[DigitalElise]

Thanks for creating such a excellent addon!

1. It would be awesome if we were able to replace the window frame image you've used with our own custom image. I can see you used base64 img so not sure how easy this will be.

2. Would it be possible to add an option to superimpose one blind on top of another, this would be useful for blockout and sheer blinds on double rollers over a singe window.