`//undo` undo the latest worldedit command<br/>
`//redo` redo what was just undone<br/>
`//show_journal` view what can be undone and redone

Related issues:
* https://github.com/Uberi/Minetest-WorldEdit/issues/43
* https://forum.minetest.net/viewtopic.php?p=296543#p296543

Supported chatcommands:
* /pos1
* /pos2
* /p
* /set
* /y
* /n

Ignored chatcommands:
* /fixlight
* /volume


TODO:
* Implement more commands
* Add mod load time info
* Add settingtypes.txt for the settings