* 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

Fixed GetReactionsUsersAsync returning an empty enumerable

Resolves #469

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

Fixed guild member's joinedat reseting after certain events

Fixed RemoveReactionAsync overload doesn't work with unicode emojis

Allows roles to be configured to be mentionable, fixes #424

this was a big one

Adds Timestamps to embeds, and removes Image and Thumbnail-Builders

**This is not a breaking change**.

This change begins to implement #379, where IUserMessage.ModifyAsync will now accept a `Discord.ModifyMessageParams` func over a `Discord.API.Rest.ModifyMessageParams` func.