[Feature request] Support for different sampler types

[aghanbar]

Great work! Is it possible to put an option in the koi menu for different samplers, it seems ancestral works better for characters.

[nousr]

definitely, seems like a reasonable addition.

I believe this will require us to move away from huggingface's diffusers library and move to the CompVis repo.

This is something I have already considered and will start working it next week along with the refactor. Doing so should give us much more freedom with what we can do with the model.