* 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

Conflicts:
	src/Discord.Net.WebSocket/DiscordSocketClient.cs

Check that messages older than two weeks are not passed to bulk delete

Connection/API lag could cause messages right on the edge of 14 weeks to fail on Discord's end when they pass our checks.

Resolves #469

This resolves #477

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

Fixed Format.Sanitize