**IMPORTANT - UPDATE IMMEDIATELY IF 1.13 OR NEWER**
Fixes a rare but severe bug that corrupted some saves that had more than 254 different types of blocks. If you lost a build due to this, contact me and I can try to help.
A special thanks to @DeadSteveGaming and @Kapitan_Floww for reporting it!
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Full sign support for newer sign types has been added.
1.13.2 - 1.16.x compatibility has been retained for the 1.13.2+ version.
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Added new EXPERIMENTAL world-rollback feature.

This feature is experimental. Do /save-all, then manually backup your world before using.
It works by backing up the entire world, then unloading the world and loading the backup when requested.
(Only added on the 1.13.2+ version)
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I spent a lot of time updating then testing this version, so I would very much appreciate donations: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Y2ZEWAJAN23CC