add native support for lobbies under 3.5 and fix 3.5

[freeze2427]

First, 3.5 is listed as a version with party support but it tells you that you must download all content, and it would be great if you could add native party support on versions older than 3.5, like 1.8 shown here. My friend was able to modify your backend to support lobbies under 3.5, but apparently he forgot how he did it and he won't explain it. At least we know its possible.

[xLoigi]

For 3.5 you need to add a extra PAK and Sig file found here: https://discord.com/channels/581850908816572416/882046879406358529/1086746857713189114 . For Partys below 3.5 the only way i know that should be possible is with a OpenFire XMPP server and a SSL Certificate. But i never tried it bc i dont know anything about SSL.

[xLoigi]

If you get it to work please message me! :)

[freeze2427]

add me on discord its freeze2427 so that i can try and get it running