Recoded the plugin once again

Changes:
- Config Revamp
- You can now have multiple join messages
- Make messages only run on certain counts (1st, 2nd, 5th join etc)
- Better audiences (People who see the message) to allow certain message for everyone else and a custom one for the player
- YML files are now used to store data instead of SQLite

If there are any issues/errors please let me know on the GitHub page

https://github.com/JustDoom/Better-Messages