Big CL3 rewrite as a temporary improvement while we still develop CL4.

This PR is not complete. It requires one more thing to be added and some extra testing.

Breaking changes:

• /ip API endpoint deprecated
• autoget arg on API endpoints is now deprecated and now always return as if autoget was true
• cmd: direct is no longer required to do a custom Meower command, custom commands can now be ran using root cmd
• ip, type, version_chk CL3 commands are now deprecated and will just return I:100 | OK
• pmsg and pvar CL3 commands now have a ratelimit of 10 messages/5 seconds
• pmsg and pvar no longer return an error if a user is not online (this would break being able to appear offline and it'd be difficult to implement with the new CL server)
• users can now be logged in on multiple clients at once
• clients will receive update_config whenever their user config is updated
• clients will receive update_post whenever a post they have access to is updated
• clients will receive update_chat whenever a chat they have access to is updated
• clients will receive delete (like when a post gets deleted) whenever they lose access to a chat they had access to
• chats won't be deleted when the owner of the chat leaves, it'll only be deleted when there are no members left or the delete_chat command was used
• users can now hide themselves from the ulist by changing invisible (boolean) in their user config
• users can now turn off chat invitations by changing the accepting_invitations (boolean) in their user config
• database has had a few things changed, requiring migration, this will be automatic but may result in data loss if something goes wrong (please backup your database before upgrading)
• user tokens will be reset and are no longer stored in the database, they will be signed tokens using HMAC
• statistics now uses estimated document counts instead of precise to help improve database performance (statistics may be a little off at times)
• server now uses MongoDB text search for searching users/posts instead of relying on regex
• users can now be temporarily banned
• an ip's country and whether it's a proxy is now stored in the database
• ips are now only stored for 90 days since their last usage
• deleted posts are now only stored for 14 days after their deletion
• deleting accounts now has a 3 day timeframe where the account owner can log back in to recover the account before it's permanently deleted
• audit logs are now made for moderation and administration actions

New API endpoints:

• /logs (can be used by level 2+s to get admin audit log events)

New CL3 commands:

• gdpr (can be used by level 4s to immediately delete a user's account)
• join_chat (used to join a chat via an invite code)
• edit_chat (can be used by the chat owner to edit a chat, can accept nickname, owner, and resetting invite_code)
• delete_chat (can be used by the chat owner to delete a chat)