* Mark guild as optional for invite
* Mark partial InviteMetadata members as Optional<T>
* Some of them aren't sent when requesting through the general GET invite endpoint
* Remove GetInviteParams
* It was kinda stupid in the first place, might as well always get the count instead of having to ask the user whether they want the two fields filled or not.
* Add ChannelType property
* Add vanity invite support
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