Quokka 21.10

Notes

This is the first release of Quokka! This version is well-tested on CPUs and NVIDIA GPUs and includes an automated test suite (see README.md) of 1D problems and additional problems (not yet automated) in 2D and 3D provided in the src subdirectory. For simplicity (and following AMReX and other codes), we have chosen to use "calendar versioning," denoting each release with the year and month.

What's Changed

• Refactor kernels to use AMReX abstractions by @BenWibking in #2
• added AMR using amrex::AmrCore by @BenWibking in #4

Full Changelog: https://github.com/BenWibking/quokka/commits/21.10