Description
Is your feature request related to a problem? Please describe.
It's really annoying sometimes when newchunk marks disappear after you close your game (say your bedtime comes up and you need to close your game for the night, the game crashes or you need to relaunch due to some other issue etc.) and you come back to find everything gone. I personally had this happen to me a number of times and I cannot explain my frustration.
Describe the solution you'd like
An option to export the currently loaded newchunks in form of a file (another pro of this option is sharing across users) and import them at a later time again when returning to a trail or so. Or keep this file in the client's directory at all times and lock the feature under an option.
Describe alternatives you've considered
(I am not exactly sure what to put here, so leaving blank.)
Additional context
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