Add a "Rename" button in main menu to rename worlds #16778
+212
−3
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fixes #16621
To do
This PR is Ready for Review.
How to test
Open Luanti and you will see the "Rename" button in main menu, select a world and then click the button, you can rename the world. After you rename the world, you can see it in the main menu. Also, you can check the folder of the world and the file "world.mt".