Documentation and misc changes

Features:

• Add version checking functionality to notify of newer versions
• Add documentation

Improvements;

• Update to Java 16 and simplify syntax with new structures
• Add more advancements to warn the mods of
• Allow createspawner to be run from the console
• Improve convertlocation
• Misc. Improvements

Fixes:

• Fix bug in listspawners
• Fix database timeout bug
• Misc. Fixes