Load ClipVision on CPU

[FNSpd]

Adds a switch to pick whether you want standard behaviour (GPU) or to load model on CPU.

Can help to run IP-Adapter on low-end systems without using shared memory, for example

[mcmonkey4eva]

The device used by ClipVision is selected here: https://github.com/comfyanonymous/ComfyUI/blob/master/comfy/model_management.py#L570-L579 which already is set to use CPU when in low VRAM mode