Stability API nodes for ComfyUI

Nodes:Stability SD3, Stability Outpainting, Stability Search and Replace, Stability Image Core, Stability Inpainting, Stability Remove Background, Stability Creative Upscale. Add API key to environment variable 'SAI_API_KEY' Alternatively you can write your API key to file 'sai_platform_key.txt' You can also use and/or override the above by entering your API key in the 'api_key_override' field of each node.