Automatic MongoDB database backups

[StrangeRanger]

Is your feature request related to a problem? Please describe. This is an extension of issue #60...

Describe the feature you'd like in detail To help protect from MongoDB "accidents"/data-loss, implement a feature that takes backups of the MongoDB databases that BulletBot uses, every so often. If not all of the databases, then only the ones that the end-user specifies and/or the important ones (i.e. main, webhooks, mStats, etc.).

On top of that, create a command called dbbackup (or something similar to that) that can be used to control different aspects of the feature detailed above. The command would be able to:

• Control/set how often the backups automatically are taken
• Manually take a backup of the database
• Enable and disable the backup feature
• Maybe: Specify which databases will be both automatically and manually backed up
• maybe a few different things