amrex: added v20.07 (#17337)
amrex: added v20.07 (#17337)

Also added support for hdf5, petsc and hypre
iulian787/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack