test/server_poll.py: fix absolute path

launch.py: using getcwd() instead curdir

launch.py: use absolute path for preparing

also remove chdir()

launch.py: use absolute path for test

launch.py: add default script_path and data_path

This may be helpful for
https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/7028,
because we won't change working directory to the repo now, instead,
we will use any working directory. If we set working directory to
a path contains repo and the custom --data-dir, the problem in this
issue should be solved.

Howewer, this may be treated as an incompatible change if some code
assume the working directory is always the repo.

Also, there may be another solution that always let --data-dir be the
subdirectory of the repo, but personally I think this may not be what
we actually need.

As this issue mainly influent on Docker and I am not familiar with
.bat files, updating webui.bat is skipped.

webui.sh: source env from repo instead $PWD

Bugfix: Filter out temporary files that will be generated if the download fails.

Add cond and uncond hidden states to CFGDenoiserParams

fix progressbar

Add lossless webp option

Add `before_process_batch` script callback

update "replace preview" link button's css

Gradio auth logic fix - Handle empty/newlines

Xyz order fix

sort upscalers by name

add: /sdapi/v1/scripts in API

modify css
`.extra-network-thumbs .card:hover .additional a` 's value from `block` to `inline-block`.
So, extensions can add more buttons to extra network's thumbnail card.

save images to correct directories

Allow saving of images generated via API

Add scaled dot product attention

feat: auto update all extensions using flag

Implement UniPC sampler

Suggested change by @akx
Co-authored-by: Aarni Koskela <akx@iki.fi>

use lowercase name for sorting; keep `UpscalerLanczos` and `UpscalerNearest` at the start of the list with `UpscalerNone`
Co-authored-by: catboxanon <122327233+catboxanon@users.noreply.github.com>