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, 1 insertions, 74 deletions

diff --git a/src/model/guild/partial_guild.rs b/src/model/guild/partial_guild.rs
index e5d463e..f5ab502 100644
--- a/src/model/guild/partial_guild.rs
+++ b/src/model/guild/partial_guild.rs
@@ -1,6 +1,5 @@
-use ::client::CACHE;
 use ::model::*;
-use ::utils::builder::{EditGuild, EditMember, EditRole, Search};
+use ::utils::builder::{EditGuild, EditMember, EditRole};
 
 impl PartialGuild {
     /// Ban a [`User`] from the guild. All messages by the
@@ -381,78 +380,6 @@ impl PartialGuild {
         self.id.move_member(user_id, channel_id)
     }
 
-    /// Performs a search request to the API for the guild's [`Message`]s.
-    ///
-    /// This will search all of the guild's [`Channel`]s at once, that you have
-    /// the [Read Message History] permission to. Use [`search_channels`] to
-    /// specify a list of [channel][`GuildChannel`]s to search, where all other
-    /// channels will be excluded.
-    ///
-    /// 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
-    /// [`Channel`]: enum.Channel.html
-    /// [`GuildChannel`]: struct.GuildChannel.html
-    /// [`Message`]: struct.Message.html
-    /// [`Search`]: ../utils/builder/struct.Search.html
-    /// [`search_channels`]: #method.search_channels
-    /// [Read Message History]: permissions/constant.READ_MESSAGE_HISTORY.html
-    pub fn search<F: FnOnce(Search) -> Search>(&self, f: F) -> Result<SearchResult> {
-        #[cfg(feature="cache")]
-        {
-            if CACHE.read().unwrap().user.bot {
-                return Err(Error::Client(ClientError::InvalidOperationAsBot));
-            }
-        }
-
-        self.id.search(f)
-    }
-
-    /// Performs a search request to the API for the guild's [`Message`]s in
-    /// given channels.
-    ///
-    /// This will search all of the messages in the guild's provided
-    /// [`Channel`]s by Id that you have the [Read Message History] permission
-    /// to. Use [`search`] to search all of a guild's [channel][`GuildChannel`]s
-    /// at once.
-    ///
-    /// 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
-    /// [`Channel`]: enum.Channel.html
-    /// [`GuildChannel`]: struct.GuildChannel.html
-    /// [`Message`]: struct.Message.html
-    /// [`Search`]: ../utils/builder/struct.Search.html
-    /// [`search`]: #method.search
-    /// [Read Message History]: permissions/constant.READ_MESSAGE_HISTORY.html
-    pub fn search_channels<F>(&self, channel_ids: &[ChannelId], f: F)
-        -> Result<SearchResult> where F: FnOnce(Search) -> Search {
-        #[cfg(feature="cache")]
-        {
-            if CACHE.read().unwrap().user.bot {
-                return Err(Error::Client(ClientError::InvalidOperationAsBot));
-            }
-        }
-
-        self.id.search_channels(channel_ids, f)
-    }
-
     /// Returns the formatted URL of the guild's splash image, if one exists.
     pub fn splash_url(&self) -> Option<String> {
         self.icon.as_ref().map(|icon|