API rewrite

[moehreag]

• [ ] backend by ~~gart~~ Astralchroma
• [x] friends system
• [x] in-game chat
• [x] Status update notifications for friends
• [ ] add an actual privacy policy (UUIDs are PID)! Link where it'll be (hopefully): ~~https://axolotlclient.xyz/privacy~~
• [x] notice screen to inform users about the privacy policy
• [x] add machete to reduce file size
• ~~fix API bugs (friends/online/blocked only showing yourself, ...)~~
• [x] port screenshot sharing to the new API
• ~~remove testing values from the code as soon as the backend is functional for these features~~
• [x] rewrite discord rpc to use the sockets directly via DiscordIPC
• [x] account for Hypixel's API changes

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• [x] port to ~~1.19.4~~ ~~1.20(.1)~~

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• testing things is on your own behalf, things may or may not break and/or other things.

Replacement for #68, but now it's not a branch on upstream (but on our own fork instead)