Developer debug mode and improvements.

The developer release

⚠️ Because this version has a lot of internal behaviors changed, it's still in beta!

This new update brings a whole new way for developers to debug their code: the developer debug mode!
It can be enabled in the configuration file (developer-debug: true) and will print useful information such as:

• Null/not set values
• Wrong type
• Errors not handled by the default error handler
  It'll also contain the exact file and line on where the error happened! I'd love to hear your feedback on that :)

I also updated JDA to alpha9, and will implement the small new features within the month!

⬇️ Download: https://disky.me/resources/index.php?resources/5/

Full Changelog: 4.11.1...4.12.0-beta1