Changelog
+ Imports are now asynchronous, making the app more responsive when importing tons of images. Still supports undo/redo
+ Greatly sped up map transfer, especially for Bedrock
+ You now need to double-click on worlds to instantly switch to the maps tab, this fixes right-click on worlds not really working
+ Extremely simple error message when opening a world fails, better to come later
+ Fixed some compatibility issues with the leveldb wrapper
+ Fixed various issues with Bedrock worlds closing the leveldb access at the wrong time, now only closes when world is deselected
