- Map: Rewrite MapVessels and MapInterface. MapVessels do not manage any cache any more, the MapInterface manages StackCaches (new class)
for cache_history and mod_cache. Those caches replace the old db.interface.cache. The field 'interface' for MapInterfaces is now called 'container'.
MapInterface.mod_flag is now called MapInterface.flag_mod, and it comes with MapInterface.unflag_mod (in case you need it). MapInterface cannot discard
changes on mapblocks when unloading them, it will always save them.
- Utils: Remove intFromPos since you can use Pos.getAsInt(max_val=16). Pos objects are initialized using three integers, not a dict any more
- Demos: All demos are updated to use new code
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