Bank Bot v2

Discord bot for storing files attached in messages for later retrieval. Users have their own bank accounts that they can store any number of files into, and they can then retrieve these files at will. The purpose of this functionality is to remove the need to search through chat logs to find an unpinned file that was posted long ago. This removes the need for users to store files on their local disk and can essentially use Discord attachments as their own personal storage bin. Example use cases include archiving funny memes and videos, or saving an important PDF for later use.