Overwrite entire emoji list on GuildEmojiUpdate (bwmarrin#1261)

* Overwrite entire emoji list on GuildEmojiUpdate

deleted emoji should be deleted from cache

* Updating GuildEmojis inline

Author: ozraru

state.go

@@ -1023,7 +1023,14 @@ func (s *State) OnInterface(se *Session, i interface{}) (err error) {
 		}
 	case *GuildEmojisUpdate:
 		if s.TrackEmojis {
-			err = s.EmojisAdd(t.GuildID, t.Emojis)
+			var guild *Guild
+			guild, err = s.Guild(t.GuildID)
+			if err != nil {
+				return err
+			}
+			s.Lock()
+			defer s.Unlock()
+			guild.Emojis = t.Emojis
 		}
 	case *ChannelCreate:
 		if s.TrackChannels {