replace setup.py with pyproject.toml + misc cleanup

docs/devnotes.md

@@ -228,6 +228,8 @@ pip install mutagen  # audio metadata
 pip install pyftpdlib  # ftp server
 pip install impacket  # smb server -- disable Windows Defender if you REALLY need this on windows
 pip install Pillow pyheif-pillow-opener pillow-avif-plugin  # thumbnails
+pip install pyvips  # faster thumbnails
+pip install psutil  # better cleanup of stuck metadata parsers on windows 
 pip install black==21.12b0 click==8.0.2 bandit pylint flake8 isort mypy  # vscode tooling
 ```
 
@@ -264,19 +266,20 @@ uses the included prebuilt webdeps
 if you downloaded a [release](https://github.com/9001/copyparty/releases) source tarball from github (for example [copyparty-1.6.15.tar.gz](https://github.com/9001/copyparty/releases/download/v1.6.15/copyparty-1.6.15.tar.gz) so not the autogenerated one) you can build it like so,
 
 ```bash
-python3 setup.py install --user
+python3 -m pip install --user -U build setuptools wheel jinja2 strip_hints
+bash scripts/run-tests.sh python3  # optional
+python3 -m build
 ```
 
-or if you're packaging it for a linux distro (nice), maybe something like
+if you are unable to use `build`, you can use the old setuptools approach instead,
 
 ```bash
-bash scripts/run-tests.sh python3  # optional
+python3 setup.py install --user setuptools wheel jinja2
 python3 setup.py build
+# you now have a wheel which you can install. or extract and repackage:
 python3 setup.py install --skip-build --prefix=/usr --root=$HOME/pe/copyparty
 ```
 
-if you have a very recent python where `setup.py install` finally got obliterated, see [the arch pkg](https://github.com/9001/copyparty/blob/hovudstraum/contrib/package/arch/PKGBUILD) for the current workaround until copyparty finally migrates to the toml meme
-
 
 ## complete release