loopback moved to scripts, added support for multiple batches, changed to honor save grids and how grids in web setting

This reverts commit 51a960df1fdd265e7747e19b50e25f359447587c.

Extras have none of the vars used in dir names, so they cant be saved into dirs.
+grid code cleanup

* numpy deprecation warning fix. Alternately, you could also specify float

* needs a piexif module install
* dumps the info in an Exif "UserComment"
* update to webui.bat

Add minimum requirements for skimage version

Complete cross attention update

In my defense I was doing this on my phone.

Related to https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/393

moved stable diffusion dependencies into requirements.txt
added checkout with specific commit hashes to all external repos