change live preview format to jpeg to prevent unreasonably slow previews for large images, and add an option to let user select the format

directory hiding for extra networks: dirs starting with . will hide their cards on extra network tabs unless specifically searched for
create HTML for extra network pages only on demand
allow directories starting with . to still list their models for lora, checkpoints, etc
keep "search" filter for extra networks when user refreshes the page

rename CPU RNG to RNG source in settings, add infotext and parameters copypaste support to RNG source

Makes a given manual seed generate the same images across different
platforms, independently of the GPU architecture in use.

Fixes #9613.

make launch.py use the same command line argument parser as the main program

more stylistic changes

For inpainting, this exposes the mask and masked composite and gives
the user the ability to display these in the web UI,
save to disk, or both.