attach an observer of gallery when generation in progress, if there was a image selected in gallery and gallery has only 1 image, auto re-select/open that image.

This matches behavior of prior to Gradio 3.4.1 version bump, is a quality of life feature many people enjoyed.

disabling history - i knew it was slow as fuck but i didn't realize it would also show galleries on launch

remove sigmoid and inverse sigmoid because they just did the same thing as weighed sum only with changed multiplier

load models to VRM instead of RAM (for machines which have bigger VRM than RAM such as free Google Colab server)

load models to VRM instead of RAM (for machines which have bigger VRM than RAM such as free Google Colab server)

Instead of just rounding (sometimes resulting in grids with "empty" spots), find a divisor.
For example: 8 images will now result in a 4x2 grid instead of a 3x3 with one empty spot.

Add a "History" tab 

make image params request not use temp files

fix paste always going into txt2img field

support copy-pasting new parameters for hires fix

* Add 'interrogate' and 'all' choices to --use-cpu
* Change type for --use-cpu argument to str.lower, so that choices are case insensitive