interface update doesnt seem to register on fresh install
i.e., config files deleted. although other signal handlers
seem to work. changing to using lambda fixed it, but
idk why. as a precaution, more things use lambda now.
- use wrap_gradio_gpu_call to use webUI's queue system
- remove async from fastAPI routes (turns out was what blocked requests)
- remove waiting for no requests before getting backend state
John-Henry Lim