* Fix possible invite without inviter

* Prevent the same for InviteCreate

* Update Creator property docs

* Don't disable when there's no resetTick

Sometimes Discord won't send any ratelimit headers, disabling the semaphore for endpoints that should have them.

* Undo changes and change comment

* Add HttpMethod to BucketIds

* Add X-RateLimit-Bucket

* BucketId changes

- BucketId is it's own class now
- Add WebhookId as a major parameter
- Add shared buckets using the hash and major parameters

* Add webhookId to BucketIds

* Update BucketId and redirect requests

* General bugfixes

* Assign semaphore and follow the same standard as Reset for ResetAfter

* Trim token

* Trim when assigning to AuthToken

fix for: https://github.com/discord-net/Discord.Net/issues/1436

`SlowModeInterval` property causes an exception for Announcement Channel feature if it is enabled on discord. Should be checked whether it is specified or not before set to property.

* Update build.yml

* Update azure-pipelines.yml

* Update examples to NC3.1

* Updating comments for privileged intents

* Moving updated comments to remarks

* Formatting

* Fix Ready and AlwaysDownloadUsers

Ready could fire before downloading all guild data and downloading guild users one guild per time without gateway intents is a waste of a gateway request that can support up to 1000.

* Reduce batchSize and fix count

* Fix typo

* Split xml docs line

Co-authored-by: Christopher Felegy <cfelegy@riseup.net>

* Add AllowedMentions to SendFileAsync

* Update xml reference and mocked channels

* Add Direction.Around to GetMessagesAsync

* Reuse the method

* Reuse GetMany

* Fix limit when getting from cache without message id

* Fix limit when getting from rest without message id

* Change cache return

It will return in a similar way to REST

* Support Gateway Intents

Allows supplying gateway intents through DiscordSocketConfig which will be passed through the IDENTIFY payload, in order to choose what gateway events you want to receive.

* Fixing enum casing

* Feedback

* Updating comment for GuildSubscriptions

* Comment update

* Give proper values to flag enum

* Add zero value

* Initialize lists

* Update xml docs

CreateGuildRoleParams is identical to ModifyGuildRoleParams, so just use
the latter when creating new roles.

The GuildHelper.CreateRoleAsync() was sending 2 requests to create a role. One to create the role, and one to modify the role that was created. This can be done in one request. So i have moved it to a single request to lower the amount of requests send to the api. This will also solve issue #1451.

* Add event and method

* Simplify convert to IEmote

## Summary

If PartyId isn't present, Discord.Net will throw an InvalidOperationException and not raise `MessageReceived`.
Got this a few times with my bot, stacktrace:
```
System.InvalidOperationException: This property has no value set.
   at Discord.Optional`1.get_Value() in ...\Discord.Net\src\Discord.Net.Core\Utils\Optional.cs:line 20
   at Discord.WebSocket.SocketMessage.Update(ClientState state, Message model) in ...\Discord.Net\src\Discord.Net.WebSocket\Entities\Messages\SocketMessage.cs:line 157
   at Discord.WebSocket.SocketUserMessage.Update(ClientState state, Message model) in ...\Discord.Net\src\Discord.Net.WebSocket\Entities\Messages\SocketUserMessage.cs:line 58
   at Discord.WebSocket.SocketUserMessage.Create(DiscordSocketClient discord, ClientState state, SocketUser author, ISocketMessageChannel channel, Message model) in ...\Discord.Net\src\Discord.Net.WebSocket\Entities\Messages\SocketUserMessage.cs:line 53
   at Discord.WebSocket.DiscordSocketClient.ProcessMessageAsync(GatewayOpCode opCode, Nullable`1 seq, String type, Object payload) in ...\Discord.Net\src\Discord.Net.WebSocket\DiscordSocketClient.cs:line 1210
```

After looking all properties, this is the only one that could be blamed and was already fixed for `RestMessage`s, see #1337 

## Changes

- `Value` to `GetValueOrDefault()` for `PartyId`

- Remove GatewayLimits
- Transfer a few properties to DiscordSocketConfig
- Remove unnecessary usings

- Add session_start_limit to GetBotGatewayResponse
- Add GetBotGatewayAsync to IDiscordClient
- Add master/slave semaphores to enable concurrency
- Not store semaphore name as static
- Clone GatewayLimits when cloning the Config

The only account limit is for identify that is dealt in a different way (exclusive semaphore), so websocket queues can be shared with REST and don't need to be shared between clients anymore.

Also added the ratelimit for presence updates.

* Check Dictionary

Check Dictionary instead of creating a new IReadOnlyCollection and looping in it

* Add Remark to MutualGuilds

* Add GetUsersAsync to SocketGuild

* Fix IGuild return

* Do not download unless needed

* Updating webhook regex for discord.com

Updates webhook URL regex matching for discordapp.com and discord.com

* Fixing comment

* Whitespace

* Added PublishAsync to Messages.

* Added missing implementation.

* 1. Aligned with naming standards
2. Clarified xml docs
3. Properly threw exceptions instead of failing silently.

* Additional documentation included.

* Removed un-needed comments.

Co-authored-by: Matt Smith <v-matsm@microsoft.com>

If the current reset time is in the past, then somebody else in the
current bucket must have made a request before we were able to. To
prevent accidental ratelimits, we fall-back to the second sleep
branch, as if the reset time wasn't specified at all.

Additionally Extracts the minimum sleep time to a constant, and also
bumps it to 750ms.