Store the version used to initialize the map in the map_env.txt file.
- if a version is stored in the map_env.txt file, it is used.
- if the map is new, the current game version is used.
- if the map is old, 0.87 is assumed for compatibility.
Reviewed-on: https://git.minetest.land/VoxeLibre/VoxeLibre/pulls/4762
Reviewed-by: the-real-herowl <the-real-herowl@noreply.git.minetest.land>
Co-authored-by: kno10 <erich.schubert@gmail.com>
Co-committed-by: kno10 <erich.schubert@gmail.com>
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