Remove selfbot support

While selfbots have always been "roughly tolerated", lately they have
been tolerated to less of a degree.

The simple answer is to no longer support selfbots in any form. This is
done for a few of reasons: 1) in anticipation of selfbots no longer
being tolerated; 2) there are few reasons why one should make a selfbot
in Rust and not a scripting language; 3) there are alternatives
(i.e. discord-rs) that still support userbots. Selfbots are simply not
a goal of the maintainer of serenity.

Upgrade path:

Don't use selfbots with serenity. Use discord-rs instead.

The following has been removed:

Enums:

- `RelationshipType`

Structs:

- `FriendSourceFlags`
- `ReadState`
- `Relationship`
- `SearchResult`
- `SuggestionReason`
- `Tutorial`
- `UserConnection`
- `UserGuildSettings`
- `UserSettings`

Removed the following fields:

- `CurrentUser::mobile`
- Ready::{
     analytics_token,
     experiments,
     friend_suggestion_count,
     notes,
     read_state,
     relationships,
     tutorial,
     user_guild_settings,
     user_settings,
 }

Removed the following methods:

- `Client::login_user`

Deprecated `Client::login_bot` in favour of `Client::login`.

Removed `client::LoginType`.

The following no longer take a `login_type` parameter:

- `Context::new`
- `Shard::new`

`Shard::sync_guilds` has been removed.

The `client::Error::{InvalidOperationAsBot, InvalidOperationAsUser}`
variants have been removed.

The following event handlers on `Client` have been removed:

- `on_friend_suggestion_create`
- `on_friend_suggestion_delete`
- `on_relationship_add`
- `on_relationship_remove`
- `on_user_guild_settings_update`
- `on_note_update`
- `on_user_settings_update`

The following `client::rest` functions have been removed:

- `ack_message`
- `edit_note`
- `get_user_connections`
- `search_channel_messages`
- `search_guild_messages`

The following `client::rest::ratelimiting::Route` variants have been
removed:

- `ChannelsIdMessagesSearch`
- `GuildsIdMessagesSearch`
- `UsersMeConnections`

The following fields on `ext::cache::Cache` have been removed:

- `guild_settings`
- `relationships`
- `settings`

while the following methods have also been removed:

- `update_with_relationship_add`
- `update_with_relationship_remove`
- `update_with_user_guild_settings_update`
- `update_with_user_note_update`
- `update_with_user_settings_update`

The following methods have been removed across models:

- `ChannelId::{ack, search}`
- `Channel::{ack, search}`
- `Group::{ack, search}`
- `GuildChannel::{ack, search}`
- `GuildId::{search, search_channels}`
- `Guild::{search, search_channels}`
- `Message::ack`
- `PartialGuild::{search, search_channels}`
- `PrivateChannel::{ack, search}`
- `UserId::{delete_note, edit_note}`
- `User::{delete_note, edit_note}`

The following events in `model::events` have been removed:

- `FriendSuggestionCreateEvent`
- `FriendSuggestionDeleteEvent`
- `MessageAckEvent`
- `RelationshipAddEvent`
- `RelationshipRemoveEvent`
- `UserGuildSettingsUpdateEvent`
- `UserNoteUpdateEvent`
- `UserSettingsUpdateEvent`

Consequently, the following variants on `model::event::Event` have been
removed:

- `FriendSuggestionCreate`
- `FriendSuggestionDelete`
- `MessageAdd`
- `RelationshipAdd`
- `RelationshipRemove`
- `UserGuildSettingUpdate`
- `UserNoteUpdate`
- `UserSettingsUpdate`

The `utils::builder::Search` search builder has been removed.

1 files changed, 2 insertions, 48 deletions

diff --git a/src/model/channel/group.rs b/src/model/channel/group.rs
index 9d3335f..f287e9a 100644
--- a/src/model/channel/group.rs
+++ b/src/model/channel/group.rs
@@ -1,36 +1,11 @@
 use std::borrow::Cow;
 use std::fmt::Write as FmtWrite;
 use std::io::Read;
-use ::client::{CACHE, rest};
+use ::client::rest;
 use ::model::*;
-use ::utils::builder::{CreateMessage, GetMessages, Search};
+use ::utils::builder::{CreateMessage, GetMessages};
 
 impl Group {
-    /// Marks the group as being read up to a certain [`Message`].
-    ///
-    /// Refer to the documentation for [`rest::ack_message`] for more
-    /// information.
-    ///
-    /// # Errors
-    ///
-    /// If the `cache` is enabled, returns a
-    /// [`ClientError::InvalidOperationAsBot`] if the current user is a bot
-    /// user.
-    ///
-    /// [`ClientError::InvalidOperationAsBot`]: ../client/enum.ClientError.html#variant.InvalidOperationAsUser
-    /// [`Message`]: struct.Message.html
-    /// [`rest::ack_message`]: ../client/rest/fn.ack_message.html
-    pub fn ack<M: Into<MessageId>>(&self, message_id: M) -> Result<()> {
-        #[cfg(feature="cache")]
-        {
-            if CACHE.read().unwrap().user.bot {
-                return Err(Error::Client(ClientError::InvalidOperationAsBot));
-            }
-        }
-
-        self.channel_id.ack(message_id)
-    }
-
     /// Adds the given user to the group. If the user is already in the group,
     /// then nothing is done.
     ///
@@ -257,27 +232,6 @@ impl Group {
         self.channel_id.say(content)
     }
 
-    /// Performs a search request to the API for the group's channel's
-    /// [`Message`]s.
-    ///
-    /// Refer to the documentation for the [`Search`] builder for examples and
-    /// more information.
-    ///
-    /// **Note**: Bot users can not search.
-    ///
-    /// # Errors
-    ///
-    /// If the `cache` is enabled, returns a
-    /// [`ClientError::InvalidOperationAsBot`] if the current user is a bot.
-    ///
-    /// [`ClientError::InvalidOperationAsBot`]: ../client/enum.ClientError.html#variant.InvalidOperationAsBot
-    /// [`Message`]: struct.Message.html
-    /// [`Search`]: ../utils/builder/struct.Search.html
-    #[inline]
-    pub fn search<F: FnOnce(Search) -> Search>(&self, f: F) -> Result<SearchResult> {
-        self.channel_id.search(f)
-    }
-
     /// Sends a file along with optional message contents. The filename _must_
     /// be specified.
     ///