Exiting Program Gracefully and Included Check if User Doesn't Use Keyboard and Enter Key To Make Selection

[moonsdust]

In this PR:

• Script now checks for keyboard interruption and exits the app. It no longer throws error messages or shows the invalid token error.
• In order to fix the problem where you have to use CTRL-C a couple of times while you are currently on a list-type prompt, every list-type prompt has an option to exit the app.
• Included check for KeyError, which happens if the user doesn't use their keyboard and enter key to make a selection. This check gives the user the option to go through the steps again. If they continue to not use their keyboard and enter key, app will be exited.