added toBigInt and BigInt getters to bitfields

use mongoose autopopulate

fix Message Model

remove date_of_birth as discord only saves if someone is older than 18 years (nsfw_allowed)

Convert id bigint to string

fix User Model guilds

add date of birth to user

revert guilds in user_data

save private data in user.user_data

changed number to date type

AuditLog

Fix Member Model

revert changes

UserModel remove guild bigint array -> instead use MemberModel

fix database

export MongooseCache

mongoose Schemas

move guild arrays into seperate collections

updated other models

add guilds array to user model

Move Models/Schemas to server-util