* Add IChannel.Nsfw, RequireNsfw precondition

* Refactored IChannel.Nsfw to IsNsfw, removed NsfwUtils

Per pull-request feedback

* proper nsfw channel check

* Removed GuildUserExtensions and moved the methods to IGuildUser and implementations

* Made changes per fox's suggestion: Change->Modify. New Modify overload.

* Oops

* Per Volt: reimplemented new endpoints

* Fixing broken docstrings

* I forgot that docstrings are XML

* Implemented atomic add/remove role endpoints

* Removed  so people aren't irked

* Added single-item role add/remove methods

Added support for reaction 'me' field

Automatic animated avatar detection

Resolves #469

This is to support the new user image endpoint, which provides a parameter for image resizing.

there's a few different ways to select a user's roles from their role IDs, and this one seems to be the most efficient.

doesn't seem like there's any reason this shouldn't be included.

Fixed users not being updated on PRESENCE_UPDATEs

Fixed guild member's joinedat reseting after certain events