new features

initial work on #62 (support identity providers, oauth/SSO/...); see readme
- only authentication so far; no authorization yet, and users must exist in the copyparty config with bogus passwords
new option --ipa rejects connections from clients outside of a given allowlist of IP prefixes
environment variables can be used almost everywhere that takes a filesystem path; should make it way more comfy to write configs for docker / systemd
#59 added a basic docker-compose yaml and an example config
- probably much room for improvement on everything docker still

bugfixes

the nftables-based port-forwarding in the systemd example was buggy; replaced with CAP_NET_BIND_SERVICE
palemoon-specific js crash if a text selection was dragged
text selection in messageboxes was jank

improved systemd example with hardening and a better example config
logfiles are flushed for every line written; can be disabled with --no-logflush for ~3% more performance best-case
iphones probably won't broadcast cover-art to car stereos over bluetooth anymore since the thingamajig in iOS that's in charge of that doesn't have cookie-access, and strapping in the auth is too funky so let's stop doing that b7723ac
- can be remedied by enabling filekeys and granting unauthenticated people access that way
  - willing to bet $5 nobody would have noticed any of this if it wasn't for this changelog, I mean who uses iPhones anyways ( ﾟヮﾟ)

download link	is it good?	description
copyparty-sfx.py	✅ the best 👍	runs anywhere! only needs python
a docker image	it's ok	good if you prefer docker 🐋
copyparty.exe	⚠️ acceptable	for win8 or later; built-in thumbnailer
u2c.exe	⚠️ acceptable	CLI uploader as a win7+ exe (video)
copyparty32.exe	⛔️ dangerous	for win7 -- never expose to the internet!
cpp-winpe64.exe	⛔️ dangerous	runs on 64bit WinPE, otherwise useless