Added

A confirmation when you manually delete a thread message embed.
Config var enable_eval defaults true, set enable_eval=no to disable the eval command. (GH #2803)
Added ?plugins reset command to completely reset everything related to plugins. This will fix some problems caused by broken plugins in the file system.
Support private GitHub repos for plugins (thanks to @officialpiyush pr#2767)

Changed

Bump discord.py version to v1.3.3.
Renamed bot.owner_ids to bot.bot_owner_ids as the attribute is now defined internally for team support.
Deleting channel manually will now close the thread.
Deleting messages will no longer cause the bot to produce warnings.
Plugins will automatically be removed when it fails to load.
Moved all database-related activities to clients.py under MongoDBClient, with possible future hook for additional database support.
bot.db is deprecated in favour of bot.api.db and will be removed in the future.
Deprecated bot.plugin_db.get_partition in favour of bot.api.get_plugin_partition (not final).
Deprecated `MON