add tests for updated Minecraft world format

support Minecraft 26.1 world format

update PHPUnit

Merge pull request #23 from aternosorg/tests-workflow

install lz4 extension in tests.yaml

add tests.yaml

add test script to composer.json

partially support external chunks

add chunk and region position to errors in InhabitedTimePattern

add mca file name to error messages in McaReader and McaWriter

update license year

correctly stop taskmaster after it's done

update README

do not try to read empty region files, decrease read chunk size

add Thanos class, update thanos cli to use new system