Structure Block Tools

EDIT: This version was originally made for 1.21-1.21.5, but now serves as the last release version for 1.21-1.21.4. Version 1.21.5 is now covered by later releases.

Original Changelog:

• MASSIVE performance improvement for Dynamic Fill. This function should run much faster on very large structures (it may still be laggy, just significantly less so than before)
• Fixed a visual glitch with the info advancement in versions prior to 1.21.5