xtl
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Lower the minimum CMake version to 3.16
Description
Lower the minimum CMake version to allow installing on LTS versions of Ubuntu, since the actual CMake code doesn't require the new CMake version.
Arguably it would be better to change it to 3.22, since Ubuntu 20.04 is now not supported anymore, but since all the code works with 3.16, I decided to go with 3.16.