Commit decadc94 authored by Committed by Lukas Riedel
Update Docker base image to Ubuntu 20.04 LTS
This updates the Docker base image and testing system to the most recent Ubuntu with LTS. Accordingly, the software requirements have been updated. * Update Docker base image to Ubuntu `focal`. * Switch to Ubuntu version based tagging scheme of base image. * Update CMake configuration to CMake v3.16. * Use spdlog as external dependency and remove Git Submodule. * Update installation instructions in README.md * Make code compliant to recent Python and compiler versions.
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