Hi! I added some new features to my plugin!

I added :
- You can now stick the prefix and the message together. Just activate the new "stickytext" function in the configuration.
- I have again optimized a part of my code to make your server always more efficient
- I added comments to the configuration file to help you better understand the configuration (comments are only visible for new installations)
- The plugin can now update its own configuration automatically. It will retrieve your old values and adapt them to the new file. However, the comments will be deleted.