Update black hole mod for compatibility with Minecraft 1.21.11
    
    - Added commands to "kill" the blackhole, removing the display entities that are left floating
    - Fixxed texture pack issues
    - Minor code cleanups and changes
    - Updated README to include documentation for "/blackhole kill" command

    Update black hole mod for compatibility with Minecraft 1.21.9 and 1.21.10

Update black hole for support of 1.21.6, 1.21.7 and 1.21.8 and remove unused NBT handling

Update to 1.21.5

No changelog was specified.