Initial pass at making slash commands respond as expected

* Fix MessageUpdate when there's no channel cached

* Fix message events

* Fix cacheable type

* Fix examples

* Revert MessageUpdated

Fix content length check in CreateInteractionResponse()

* Remove obsolete methods and properties

* Remove rest of GuildEmbed

* Remove TokenType.User

* Changes regarding the removal of the user tokentype

* Remove DM cache and fix references

* Move line back to where it was

* Create DM channel with id and author alone

* Unneeded cast

Sorting with the highest number first is *de*scending order.

Missing "," in the EmbedBuilder code. Do I get the pedantic unlocked now?

* First changes to the config

* Lots of changes to fit the new version

* Remove PermissionTargetConverter

This pull request adds the Discord Certified Moderator badge flag to the User Flags
PR in discord-api-docs: https://github.com/discord/discord-api-docs/pull/2946

Merged Discord.Net/dev into here

MESSAGE_REACTION_REMOVE_EMOJI events were triggering REST calls by invoking `RemoveAllReactionsForEmoteAsync` instead of `RemoveReactionsForEmote`, the latter being to handle cached message state cleanup.

* Scaffold Add/Remove roles by id. (needs impl & docs)

* Add docs

* Add implementation

* Expose Add/Remove role endpoints

* Formatting

* Fix wrong method call