Do some improvements to the codebase

[DoNotSpamPls]

Don't merge this yet, it still has some work to be done, here's what I've done so far:

• Shade bStats instead of having the class in the plugin
• Use POM placeholders in plugin.yml and config.yml (get it, because... it's a placeholder plugin 😏
  okay i'm out)
• Use Bukkit's config load system instead of making the config on the fly.

[Banbeucmas]

#1

[extendedclip]

Thank you for the contribution, means a lot 💖