- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
* Add universal build_type variant to CMakePackage
* Override build_type in some packages with different possible values
* Remove reference to no longer existent debug variant
* Update CBTF packages with new build_type variant
* Keep note on build size of LLVM
* eccodes: new package for encoding and decoding meteorological data
* eccodes: remove line breaks from package docstring
* eccodes: simplify names of variants
* eccodes: give a description for each variant
* eccodes: use succinct code for cmake_args
* eccodes: found extra dependency for python variant
* eccodes: add URL for a list of available releases
