Update to 1.21.9

thanks to Fantomrat

Update to 1.21.6 Updated public domain feature: now you can revert accessibility change for certain stack of canvases

Added new config values: now you can disable public domain feature and configure number of maximum players in canvas lore

added "public domain" feature for canvas +crafter can craft these canvases; added translation to ukranian

Fixed regex for adding authors (allowing "_") +Now you can add/remove authors ignoring case, preventing duplicate nicknames, and allowing removal in any case (but canvas copying remains case-sensitive)