Add isobot user commands for some already-existing slash commands

[notsniped]

User Commands!

This allows easier and quicker access to some important isobot commands, as well as being able to take full advantage of the Discord client UI for isobot.

User commands had to be limited to a maximum of 5 command, which led to the removal of a few planned user commands. However, the most important user commands have been retained.

Added User Commands

• Show Balance - Shows the wallet and bank balance of the user on the CurrencyAPI db.
• View Rank - Views the current level and XP of the user.
• Show Warnings - Shows all of the user's active warnings in the server.
• Show User Information - Shows general Discord and basic information of the user.
• View isobot Profile - Shows isobot-related information of the user.