Advanced Monsters Datapack

This update actually only changes a few code internal things, but overall improves the quality and usability.

Changed:

• Datapack core updatet
  • Test for wrong Minecraft version or server software added
  • Datapack updater added
  • Better installation of the datapack
  • Better compatibility with other datapcks
  • Debug function added
• Clearer code
• Better method to change the name of an advanced monster
• Internal variable names

Bug fixes:

• Datapack icon was not displayed
• When asked if you really want to uninstall the datapack, the name of the datapack was not mentioned.