Code and functionality cleanup

[Pacmens]

The bot has gone through numerous changes over the time of development most recently an update of the versions of lavaplayer and discord4j.

This is a great time to also bring up other things that might be slightly outdated.

It should also be taken as an opertunity to go over the code and functionality and clean it up. This should include:

• Update all framework dependency versions and if needed change code to comply with their changes
• Extend package structure to improve locatability of items
• Remove hardcoded variables to constants, create classes to gather constants where reasonable
• Change functionality of commands where necessary to ensure internal consistency
• Cut down on redundant code by:
  • Outsourcing common tasks to generic util classes
    • [#254] Improving message utility tools #255 Adding more functionality to maintain code.
  • Moving repeated code to methods
• Cleaning up class, package and variable naming
• Cleaning up the HeraUtil class #269
• Bettering the code documentation #256 Improve code documentation